Adding 100rwhp to c5
08-14-2018, 05:19 PM
#1
Melting Slicks
Thread Starter
Adding 100rwhp to c5
Was wonder will a new head get me to about 100 rwhp on a slightly upgraded ls1 engine. Hi flow air intake..I’m pretty sure the cam isn’t of factory spec. Hi flow exhaust. Not sure if the 853’s are ported or not they have never taken them off. Let’s assume there factory. Will the other supporting mods will a new head like ported 243 justify the 100rwhp over the stock 350hp? Or if the factory heads aren’t ported just port and rebuild the valve train same ending result? Maybe throw on on 90mm ls6 intake in the mist. I saw some where one guy implies the ls1 intake acts like a choke under higher air flow..
Last edited by Speedy007; 08-14-2018 at 05:20 PM.
08-14-2018, 05:26 PM
#2
Heel & Toe
From my personal research on the topic, it's possible, but requires heads/headwork, a very large cam, LT's/Full exhaust, and a good tune. Based on the money spent, boost or nitrous would be more cost effective. Again, this is based on my own research, and I'm sure someone with more expertise will chime in shortly.
The following users liked this post:
CorvetteBrent (08-17-2018)
08-14-2018, 05:31 PM
#3
Administrator
Member Since: Mar 2001
Location: In a parallel universe. Currently own 2014 Stingray Coupe.
Posts: 342,739
Received 19,234 Likes
on
13,933 Posts
C7 of the Year - Modified Finalist 2021
MO Events Coordinator
St. Jude Co-Organizer
St. Jude Donor '03-'04-'05-'06-'07-'08-'09-'10-'11-'12-'13-'14-'15-'16-'17-'18-'19-
'20-'21-'22-'23-'24
NCM Sinkhole Donor
CI 5, 8 & 11 Veteran
Moved to C5 Tech.
08-14-2018, 05:36 PM
#4
Drifting
Trying to understand the question: I'm going through these mods myself right now. Heads alone won't gain you 100hp.
A 100% stock a C5 should have around 315ish rwhp. To get to 400 rwhp you will need (at least) a cam, 243 or 799 heads, LS6 intake manifold, LT headers, full exhaust, intake, and tune.
A 100% stock a C5 should have around 315ish rwhp. To get to 400 rwhp you will need (at least) a cam, 243 or 799 heads, LS6 intake manifold, LT headers, full exhaust, intake, and tune.
08-14-2018, 05:37 PM
#5
Melting Slicks
Thread Starter
Nitrous gotta hit the brakes on that idea. Although a methanol spray might be in the build later down the road. I’m just wonder if the heads. Along with the other mods would push to that 450 ish mark. I don’t think I had included the rear diff was also change so @ 83 the cars rpm is @ 1750 1900rmps @ 100 Also the car does run shorty headers..out here in Cali you gotta keep it smog legal
Last edited by Speedy007; 08-14-2018 at 05:38 PM.
The following users liked this post:
CorvetteBrent (08-17-2018)
08-14-2018, 05:37 PM
#6
Race Director
Was wonder will a new head get me to about 100 rwhp on a slightly upgraded ls1 engine. Hi flow air intake..I’m pretty sure the cam isn’t of factory spec. Hi flow exhaust. Not sure if the 853’s are ported or not they have never taken them off. Let’s assume there factory. Will the other supporting mods will a new head like ported 243 justify the 100rwhp over the stock 350hp? Or if the factory heads aren’t ported just port and rebuild the valve train same ending result? Maybe throw on on 90mm ls6 intake in the mist. I saw some where one guy implies the ls1 intake acts like a choke under higher air flow..
The following users liked this post:
CorvetteBrent (08-17-2018)
08-14-2018, 08:40 PM
#8
Trying to understand the question: I'm going through these mods myself right now. Heads alone won't gain you 100hp.
A 100% stock a C5 should have around 315ish rwhp. To get to 400 rwhp you will need (at least) a cam, 243 or 799 heads, LS6 intake manifold, LT headers, full exhaust, intake, and tune.
A 100% stock a C5 should have around 315ish rwhp. To get to 400 rwhp you will need (at least) a cam, 243 or 799 heads, LS6 intake manifold, LT headers, full exhaust, intake, and tune.
Callaway '01-04 Honker intake
LS6 MAF and ported throttle body
stock LS6 intake
stock '06 243 heads (non Z06)
LS6 short block but with forged -2cc pistons, forged rods and Melling HP oil pump
stock gaskets including '02-04 GM MLS heads gasket - Cometic 0.040" MSL would have boosted compression back closer to 10.75:1
Comp 226/230 0.598"/0.608" 113+2 LSA camshaft, 26926 dual springs, Ti retainers, Trunion upgrade and 7.300" push rods
LS7 lifters in LS2 trays and LS2 timing chain
160 degree thermostat
LG Pro 1-3/4" and 3" catted X-pipe both ceramic coated, '01-04 Ti Z06 exhaust
FAST 36 lbs/hr injectors and a conservative tune
To get the added power to the ground he swapped in an '01-04 Z06 torque tube with a stock GM LS3/LS7 flywheel/clutch. A fabricated all aluminum radiator and an oil cooler would also be handy. Another thing to consider is the stronger '01-04 3-rib differential if you have the '97-00 single rib unit in the car now.
If I wanted more then I would have to step up to say a LS2 throttle body, a FAST intake and say TEA 215cc CNC ported heads with the Cometic MLS head gaskets and maybe a bit more camshaft but then again maybe not - that would help boost the power numbers closer to say 445-450 rwhp. Short of more cubic inches that is about the streetable limit.
Last edited by JHrinsin; 08-14-2018 at 08:59 PM.
08-14-2018, 10:14 PM
#9
Melting Slicks
Thread Starter
Would I be around that 450 ish mark with my supporting mods. Vararam intake, hiflow exhaust, shortty headers. Different rearend gears I have no idea how to calculate what spec they are I just know the differential is not original. Possibly the cam is a z06 or higher spec. If changing the heads to a 243 or port my 853’s with a tune will get me roughly where I would like to be then it’s all good. Thoughts on where the hp mark is on this ? Minus the 90mm ls6 intake I plan to throw on. Overall goal blow the c7 and c9 away. Or at least keep up with ease. Sorry for the miscombobulated order.
08-14-2018, 11:31 PM
#10
Le Mans Master
C9 (assuming you meant C8), big unknown target. You better do some serious work to keep up with those Joneses. Rear end, FI, tranny work (... tires, fenders.. and then maybe not possible at all), someone tell me I'm wrong.
Last edited by grantv; 08-14-2018 at 11:40 PM.
08-15-2018, 12:23 AM
#11
Race Director
Member Since: Dec 2010
Location: Atlanta, GA
Posts: 10,426
Received 1,261 Likes
on
1,056 Posts
2020 Corvette of the Year Finalist (performance mods)
C5 of Year Winner (performance mods) 2019
if you want to blow away a c7 in acceleration/straight line and being in California, an a&a blower kit makes the most sense to me but it won't be cheap by any means
08-15-2018, 03:04 AM
#13
Le Mans Master
The following users liked this post:
CorvetteBrent (08-17-2018)
08-15-2018, 03:25 AM
#14
Drifting
IMO if you want to keep up with a C7 while passing California smog visual inspection and not go forced induction, an LS3 swap with bolt ons would be the best way to accomplish that. Even then, you will only just keep up with the base C7 models. The Z06 and ZR1 C7s will still blow you away, primarily because they are supercharged monsters.
Last edited by Tsumi; 08-15-2018 at 03:26 AM.
The following users liked this post:
CorvetteBrent (08-17-2018)
08-15-2018, 10:11 AM
#15
I’m a new user who recently posted. I have a ws6 that is a massive cammed head car now but I I had this cam before and So i would suggest a comp xr275 hr. 222/224 duration it SHOULD be smoggable however 100rwhp with that cam is not gonna happen. you have 853 heads? Look into PRC 225 as cast heads. They are close to same price for a set of ls6 ported heads by tea or whoever else however they are entirely aftermarket with a thicker deck and smaller chambers which allows higher compression with MORE ptv clearance. And with that small duration and lower lift number of that cam you could mill and have incredible compression to makeup for the small cam. However you will never see the cfm this head is capable of at .600 lift with this cam only being in the .560s lift range. However I’ve seen a thread where this cam and heads made 430. Drive ability wise it was nice in my m6 ws6. Had a nice idle lope but I think mine was on a 112 lsa and powerband was nice and fat. Good luck OP if you’d like an idle clip with a borla and catted long tubes I can upload you one
also to note on a head swap there’s a lot of other crap yu SHOULD upgrade. Lots of people like to go with a better oil pump. New cam retainer plate is almost required and timing chain and especially new lifters. Not ls7 junk but some morels or Johnsons. Also if not an ls6 intake already on your vette definitely pick on up. The difference between 3-400
ls6 and a 1000 fast is realistically about 20hp. Good luck with build
also to note on a head swap there’s a lot of other crap yu SHOULD upgrade. Lots of people like to go with a better oil pump. New cam retainer plate is almost required and timing chain and especially new lifters. Not ls7 junk but some morels or Johnsons. Also if not an ls6 intake already on your vette definitely pick on up. The difference between 3-400
ls6 and a 1000 fast is realistically about 20hp. Good luck with build
Last edited by Lt1slowerbird; 08-15-2018 at 10:18 AM.
08-15-2018, 10:44 AM
#16
Tech Contributor
Member Since: Dec 1999
Location: Anthony TX
Posts: 32,736
Received 2,180 Likes
on
1,583 Posts
CI 6,7,8,9,11 Vet
St. Jude Donor '08
Speedy
Even IF and WHEN you get that magic 450 RWHP goal,,,,,,,, YOU HAVE A WHOLE LOT MORE MONEY that you need to invest to make it reliable!!
TRACTION! NON EXISTANT! = On the stock size tires and normal driving rubber it will be difficult to put this power to the ground reliably!!
WHEEL HOP/DRIVE TRAIN SHAKE! = If you don't address "engine mounts" "differential mount" "shocks" & "tires" your will have a very difficult time launching, gaining traction and most likely experience wheel hop! Wheel hop can equate to broken differential and or transmission. IF,, you put sticky tires on the rear, and launch hard and gain any sort of decent traction, you will most likely pop the differential output shafts.
Your torque tube rubber couplers will most likely NOT survive the transformation. You most likely have the 10mm couplers and the rubber couplers are most likely dry rotted and ready to POP! 97-2000 C5s have the 10mm couplers.
Clutch: IS NOT GOING TO BE HAPPY with anything over 420 RWHP! You will most likely get the PEDDLE STUCH TO THE FLOOR issues.
Just some things that I've seen that give people problems when they make engine mods.
I have an 02 ZO6 that I've modded and have reached that goal. TRUST ME,,, IF,,,,,,,,,,,,,,,,,,,,,,,,,,,, I had it to do ALL OVER AGAIN, I would have gone the Forced Induction Route!!!!!!! Not that I don't like my Heads, Cam, Fast 90/90, Header engine; but the FI engine is MUCH MORE drivable and reliable.
BC
Even IF and WHEN you get that magic 450 RWHP goal,,,,,,,, YOU HAVE A WHOLE LOT MORE MONEY that you need to invest to make it reliable!!
TRACTION! NON EXISTANT! = On the stock size tires and normal driving rubber it will be difficult to put this power to the ground reliably!!
WHEEL HOP/DRIVE TRAIN SHAKE! = If you don't address "engine mounts" "differential mount" "shocks" & "tires" your will have a very difficult time launching, gaining traction and most likely experience wheel hop! Wheel hop can equate to broken differential and or transmission. IF,, you put sticky tires on the rear, and launch hard and gain any sort of decent traction, you will most likely pop the differential output shafts.
Your torque tube rubber couplers will most likely NOT survive the transformation. You most likely have the 10mm couplers and the rubber couplers are most likely dry rotted and ready to POP! 97-2000 C5s have the 10mm couplers.
Clutch: IS NOT GOING TO BE HAPPY with anything over 420 RWHP! You will most likely get the PEDDLE STUCH TO THE FLOOR issues.
Just some things that I've seen that give people problems when they make engine mods.
I have an 02 ZO6 that I've modded and have reached that goal. TRUST ME,,, IF,,,,,,,,,,,,,,,,,,,,,,,,,,,, I had it to do ALL OVER AGAIN, I would have gone the Forced Induction Route!!!!!!! Not that I don't like my Heads, Cam, Fast 90/90, Header engine; but the FI engine is MUCH MORE drivable and reliable.
BC
The following users liked this post:
CorvetteBrent (08-17-2018)
08-15-2018, 10:52 AM
#17
I hate to agree but yes. I’m sure I’m 450-480 rwhp but the cam surge is a pita sometimes. But imo can’t beat the sound of a cammed car and the car shaking. Lol.
If I had to do it again I would have went forced induction and saved up on a 9inch.
Clutch wise your stocker will NOT live long. I went with stage 2 monster with 18lb billet flywheel. It’s awesome. Grabs hard and drives easy once you get used to the pedal being a tad stiffer
If I had to do it again I would have went forced induction and saved up on a 9inch.
Clutch wise your stocker will NOT live long. I went with stage 2 monster with 18lb billet flywheel. It’s awesome. Grabs hard and drives easy once you get used to the pedal being a tad stiffer
08-15-2018, 10:58 AM
#18
I have to agree. I’m 450-480 and i love the sound of a cam car and how it shakes you. But it is terrible driveability wise in tight traffic. But i don’t mind the cam surge. The wife hates it lol
If I were to go back and do it again I’d look into forced induction as well. I tried to reply but it didn’t go through
plus with your smog stipulation it may be easier to pass smog tests? We don’t have that where I am. Hell you roll in and they check your lights and slap your sticker on
If I were to go back and do it again I’d look into forced induction as well. I tried to reply but it didn’t go through
plus with your smog stipulation it may be easier to pass smog tests? We don’t have that where I am. Hell you roll in and they check your lights and slap your sticker on
Last edited by Lt1slowerbird; 08-15-2018 at 11:03 AM.
The following users liked this post:
CorvetteBrent (08-17-2018)
08-15-2018, 11:08 AM
#19
Tech Contributor
Member Since: Dec 1999
Location: Anthony TX
Posts: 32,736
Received 2,180 Likes
on
1,583 Posts
CI 6,7,8,9,11 Vet
St. Jude Donor '08
I have to agree. I’m 450-480 and i love the sound of a cam car and how it shakes you. But it is terrible driveability wise in tight traffic. But i don’t mind the cam surge. The wife hates it lol
If I were to go back and do it again I’d look into forced induction as well. I tried to reply but it didn’t go through
plus with your smog stipulation it may be easier to pass smog tests? We don’t have that where I am. Hell you roll in and they check your lights and slap your sticker on
If I were to go back and do it again I’d look into forced induction as well. I tried to reply but it didn’t go through
plus with your smog stipulation it may be easier to pass smog tests? We don’t have that where I am. Hell you roll in and they check your lights and slap your sticker on
Same here with smog. I had to drive mine onto the emission station rollers (totally against the state rules) because the smog gut could NOT drive the car and kept stalling it.
The following users liked this post:
CorvetteBrent (08-17-2018)
08-15-2018, 11:13 AM
#20
got A build thread? I’d like to check her out. Lol and once you do that for the guy he’s gotta pass you then. Haha. At 450+ how you pass smogs? I imagine a big cam wouldn’t pass a sniffer test