CrossFire HP?
The following users liked this post:
Stevie1982 (06-26-2016)
The following users liked this post:
Stevie1982 (06-26-2016)
06-25-2016, 10:26 PM
#4
Burning Brakes
If you believe everything you read:
- Renegade intake: manifold 20-30 HP
- Roller tappets: 15-20 HP
- K&G air filters: 3-4 HP
- Hypertech Streetrunner chip: 5-6 HP (and major improvement in trams shift points)
Mine does not have the Renegade at this point, but it has the others and I marvel at how well it runs every time I take her out. It was the undisputed domestic (and all but two highest end foreign) 'hunter killer' of its time and is every bit as much fun to drive as my new Mustang GT. The GT is an undisputed 'hunter killer' of today, but I don't feel 22 yrs. old again in anything but a 1982 C3. If only the condition of the roads were as good now as they were back then when a single pothole brought embarrassment to most communities.
- Renegade intake: manifold 20-30 HP
- Roller tappets: 15-20 HP
- K&G air filters: 3-4 HP
- Hypertech Streetrunner chip: 5-6 HP (and major improvement in trams shift points)
Mine does not have the Renegade at this point, but it has the others and I marvel at how well it runs every time I take her out. It was the undisputed domestic (and all but two highest end foreign) 'hunter killer' of its time and is every bit as much fun to drive as my new Mustang GT. The GT is an undisputed 'hunter killer' of today, but I don't feel 22 yrs. old again in anything but a 1982 C3. If only the condition of the roads were as good now as they were back then when a single pothole brought embarrassment to most communities.
The following users liked this post:
Stevie1982 (06-26-2016)
06-26-2016, 10:59 AM
#5
Team Owner
If you keep the stock throttle bodies and intake, not much. But, you can always install a better intake or open up the inlets on the stock intake PLUS install larger throttle bodies.
The engine is still a basic Chevy 350 small block, and it can be re-made into anything you want. If you just want to "warm it up", get stock intake opened up and install larger throttle bodies. That way, you can keep the same ECU and engine management software and get increased HP, too. Changing cam, lifters, and heads can be done while maintaining the same CrossFire ECU/software, too. Just have to keep the same ECU signal inputs when making those changes.
The engine is still a basic Chevy 350 small block, and it can be re-made into anything you want. If you just want to "warm it up", get stock intake opened up and install larger throttle bodies. That way, you can keep the same ECU and engine management software and get increased HP, too. Changing cam, lifters, and heads can be done while maintaining the same CrossFire ECU/software, too. Just have to keep the same ECU signal inputs when making those changes.
The following users liked this post:
Stevie1982 (06-26-2016)
06-26-2016, 11:20 AM
#6
I have a renegade intake for mine but haven't installed it yet.
I'm willing to 'throw this out there', I'll bet with the renegade intake, right cam, rockers, headers, alum heads etc. I'll bet you could get close to 400 hp, maybe 380 hp? I'll be pretty happy with mine if I get that. But I really like the drive-ability of my crossfire, plenty of low end grunt, great throttle response, that's really what you want for a street car. It starts up everytime too!
I'm willing to 'throw this out there', I'll bet with the renegade intake, right cam, rockers, headers, alum heads etc. I'll bet you could get close to 400 hp, maybe 380 hp? I'll be pretty happy with mine if I get that. But I really like the drive-ability of my crossfire, plenty of low end grunt, great throttle response, that's really what you want for a street car. It starts up everytime too!
The following users liked this post:
Stevie1982 (06-26-2016)
06-26-2016, 11:23 AM
#7
Awhile back (like 4 years ago) I e-mailed back and forth the guys that created the renegade intake, and they sent me back flow data that suggest the stock throttle bodies flow over 750 cfm (together). That should be plenty. Not to say boring them out wouldn't help because it probably would, but don't expect more than 10 hp.
The following users liked this post:
Stevie1982 (06-26-2016)
06-26-2016, 11:38 AM
#8
I want to thank all of you for your input!!! When the time comes, I was thinking I"d like to go around 400 HP. The stock drive train should handle that pretty good. This car only has 86,000 miles on it. For the time being I'm going to just get it running right and enjoy it. Thanks again!!!
06-26-2016, 02:44 PM
#9
Drifting
I have a renegade intake for mine but haven't installed it yet.
I'm willing to 'throw this out there', I'll bet with the renegade intake, right cam, rockers, headers, alum heads etc. I'll bet you could get close to 400 hp, maybe 380 hp? I'll be pretty happy with mine if I get that. But I really like the drive-ability of my crossfire, plenty of low end grunt, great throttle response, that's really what you want for a street car. It starts up everytime too!
I'm willing to 'throw this out there', I'll bet with the renegade intake, right cam, rockers, headers, alum heads etc. I'll bet you could get close to 400 hp, maybe 380 hp? I'll be pretty happy with mine if I get that. But I really like the drive-ability of my crossfire, plenty of low end grunt, great throttle response, that's really what you want for a street car. It starts up everytime too!
The following users liked this post:
Stevie1982 (07-04-2016)
06-26-2016, 03:27 PM
#10
Burning Brakes
It's important to remember that if you're having fun with a 200hp car, if you bump it up to 300hp (which isn't terribly expensive to do), that's a BIG jump! I remember having loads of fun in my 275hp LT1 Camaro....
The following 2 users liked this post by AboveTheLogic:
htown81vette (07-05-2016),
Stevie1982 (07-04-2016)
06-26-2016, 06:40 PM
#11
Le Mans Master
Anything is possible if you want to spend the money...
With that being said and not being a crossfire expert (but knowing a thing or 2 about the Gen 1 350 SBC )but reading some of the comments about the stock 200 Net HP 82 crossfire and the add ons such as intake, rockers, chip, cold air induction, at best you may get to 250 Net HP. If I had to bet, getting 325-350 Net HP without a major cam change (roller cam), much better heads like AFR's and a significant bump in compression to at least 9.5:1-10:1 would be very difficult, not to mention impossible, to get to 400 Net HP which would be double the stock 200 Net HP.
From what I have read, crossfires with improved throttle bodies, intake change, cam change, head change, and exhaust can make about 300 Net HP....at best
With that being said and not being a crossfire expert (but knowing a thing or 2 about the Gen 1 350 SBC )but reading some of the comments about the stock 200 Net HP 82 crossfire and the add ons such as intake, rockers, chip, cold air induction, at best you may get to 250 Net HP. If I had to bet, getting 325-350 Net HP without a major cam change (roller cam), much better heads like AFR's and a significant bump in compression to at least 9.5:1-10:1 would be very difficult, not to mention impossible, to get to 400 Net HP which would be double the stock 200 Net HP.
From what I have read, crossfires with improved throttle bodies, intake change, cam change, head change, and exhaust can make about 300 Net HP....at best
Last edited by jb78L-82; 06-26-2016 at 06:58 PM.
The following users liked this post:
Stevie1982 (07-04-2016)
06-26-2016, 08:46 PM
#12
Le Mans Master
I have heard from several on the cross-fire forum claiming up to 400 hp.but it does take a lot to get there.most did so with a different computer.All had changed heads, cam ,ported or changed intake ,bored throttlebodies.most had 250 hp to 300 hp.big improvements from heads changes and working on the intake.Lots of little things can add up to hp gains and drivablity.
The following 2 users liked this post by terry82:
htown81vette (07-05-2016),
Stevie1982 (07-04-2016)
06-26-2016, 09:35 PM
#13
Team Owner
Member Since: Oct 2004
Location: altered state
Posts: 81,242
Received 3,043 Likes
on
2,602 Posts
St. Jude Donor '05
Anyone NOT want their old renegade let me know may make a different crossfire intake project. Cubes, good head and stroke will wake up that CFI. Couple guys here running good times with them.
Alceee 1 was going 12s/low 13 Over 10 yrs ago on a very mild one ca legal too.
Alceee 1 was going 12s/low 13 Over 10 yrs ago on a very mild one ca legal too.
The following users liked this post:
Stevie1982 (07-04-2016)
06-27-2016, 06:55 AM
#15
Le Mans Master
I have heard from several on the cross-fire forum claiming up to 400 hp.but it does take a lot to get there.most did so with a different computer.All had changed heads, cam ,ported or changed intake ,bored throttlebodies.most had 250 hp to 300 hp.big improvements from heads changes and working on the intake.Lots of little things can add up to hp gains and drivablity.
Yes I failed to mention the computer change....all in all big money to get to 300 Net HP....My hunch is that those that claim 400HP are talking Gross HP, not Net HP... 400 Gross HP is probs about 340 Net HP
The following users liked this post:
Stevie1982 (07-04-2016)
06-27-2016, 09:15 AM
#16
Team Owner
Not sure why you would need to change the computer, unless you just wanted to go to OBD-II system. The stock computer just regulates fuel mixture/flow & timing based on O2 sensor reading and other engine sensors (TPS, temp, etc.). It may not be as efficient as a newer ECU system, but it should manage things OK...even with internal part changes...and you wouldn't need to alter wiring and electronic items. As long as you are keeping the same [or similar] throttle bodies, you shouldn't need to change the ECU.
If one was to install a more modern drivetrain system (engine, trans, ECU), changeover would be needed, of course.
If one was to install a more modern drivetrain system (engine, trans, ECU), changeover would be needed, of course.
Last edited by 7T1vette; 06-27-2016 at 09:18 AM.
The following users liked this post:
Stevie1982 (07-04-2016)
06-27-2016, 09:32 AM
#17
Le Mans Master
you can change and upgrade the newer cumputer ,the old one was slow and you could not make the changes they needed. You needed to make programing changes to make it run right.
The following users liked this post:
Stevie1982 (07-04-2016)
06-27-2016, 03:25 PM
#19
Le Mans Master
to have a strong 350 that's what you would have to do to it.Heads ,Cam ,Intake ,exhaust.you don't have to do the computer .under the cross-fire intake you have a standard small block 350.The throttle bodies are more of a limiting factor than the intake.you can only get so much air thru them.street car, cross-fire is fine .race car ,look for something else.
06-27-2016, 03:31 PM
#20
Burning Brakes
http://oldcarmemories.com/1982-1984-...it-or-hate-it/
The two throttle bodies are supposed to flow around 750cfm and its the intake that is the limiting factor.
The TBIs found on the L83 were 48mm Rochester units – they had a combined 750 cfm maximum flow rate. On the surface this sounded good, unfortunately that was not the complete picture. Chevrolet engineers heavily restricted the L83’s intake manifold, so much so, that only 475 cfm was the max flow rate. The first culprit was very small intake ports which were at least 35% smaller than the cylinder head ports.
Performance Plus Systems (now a defunct company), released an aftermarket free-flow Cross-Fire intake, called the X-Ram for the L83. On the outside the X-Ram looked exactly like the L83’s stock intake however inside it had a flow rate of 1440 cfm versus the stock intakes’s 475 cfm. Performance Plus Systems tested a bone stock L83 powered 1984 Corvette and obtained a quarter-mile of 15.6 seconds at 86 mph which was exactly what many of the automobile magazines obtained when testing the 1984 Corvette back in the day. Performance Plus Systems then made no other modifications to this Corvette except for replacing the stock intake with their X-Ram. The result of the change yielded a 14.3 second at 97 mph quarter-mile time which was faster than the L98’s time.
The following users liked this post:
Stevie1982 (07-04-2016)