92 ZR-1 on the dyno today
#1
POSSE ZR-1 Driver
Thread Starter
92 ZR-1 on the dyno today
All stock except Mark's chip.
326hp @ 5700, 322tq @ 4700.
Fell off to 305hp, 210tq @ 7000.
Using 15% loss as a guide, puts the engine power just about 385hp.
Not bad for a 27 year old, 20k mile car.
326hp @ 5700, 322tq @ 4700.
Fell off to 305hp, 210tq @ 7000.
Using 15% loss as a guide, puts the engine power just about 385hp.
Not bad for a 27 year old, 20k mile car.
#3
POSSE ZR-1 Driver
Thread Starter
#4
Burning Brakes
Awesome choice. My car got one of his 510 packages. He said it's the best he's done. 448 H.P. @ the wheels 528 @ the crank. Still has stock gears. I might have him install a set of 4.10's. I had them in my first car and loved them. I will go the route of more cubes when this one gets more miles and some use.
#5
POSSE ZR-1 Driver
Thread Starter
Saving up for a 415. 4:10 gear at the same time.
I have the oldest car in a modded C5, C6, C7 crowd.
Going to give them a little surprise......
I have the oldest car in a modded C5, C6, C7 crowd.
Going to give them a little surprise......
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Subfixer (05-06-2019)
#7
Le Mans Master
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2020 Corvette of the Year Finalist (performance mods)
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Pete has a 391 closed deck engine for sale on ZR1.net. I have one of his 391s, and it's great. Much more affordable than a 415 with similar power. Have been able to smack down a number of C5/6/7 on the street, although I still need 4.10s to really finish it off.
#8
Team Owner
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St. Jude Donor '05
Thats exactly what my 90 made op (cant remember at what rpm)
Bone stock, Haibeck chip, dual 3" exh which probably did nothing. lol
The 4.10 gears helped it feel a little quicker than the 13 sec car it was.
The person testing these must have had real good conditions to get it in the 12s.
Bone stock, Haibeck chip, dual 3" exh which probably did nothing. lol
The 4.10 gears helped it feel a little quicker than the 13 sec car it was.
The person testing these must have had real good conditions to get it in the 12s.
#9
POSSE ZR-1 Driver
Thread Starter
My old 64 with a 406 had a wild solid roller which made gobs of HP, but was virtually undrivable around town.
Getting older and need some comfort....
#10
Le Mans Master
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I did his "stage 2" cams, but they are not obnoxious at all. Drives perfectly fine and idles well, low speed, around town is perfectly fine. The DOHC design actually lends to running much larger cams without having a lot of the penalties you'd get in a traditional single cam OHV engine with a big cam.
#11
Le Mans Master
I saw Pete's 391. If I remember your build, you have some pretty stout cams. Other than "keeping up with the Jones" (Corvette buddies), this car will mainly be a cruiser, so a smooth idle is high on my list. The 415 I'm looking at still uses stock cams which should keep low speed, around town driving, civilized.
My old 64 with a 406 had a wild solid roller which made gobs of HP, but was virtually undrivable around town.
Getting older and need some comfort....
My old 64 with a 406 had a wild solid roller which made gobs of HP, but was virtually undrivable around town.
Getting older and need some comfort....
#12
POSSE ZR-1 Driver
Thread Starter
I'm not racing this car and usable street torque is my primary goal. More cubes, more torque, as long as the cams aren't too wild.
#13
Le Mans Master
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His claim is reasonable, but there is a lot of fuzziness to it. That 600HP is flywheel, which is hard to quantify without sticking it on an engine dyno. If you put it on a dynojet (or other roller based dyno) you have to deal with driveline loss (somewhere between 12-18%), correction factor, temp/humidity (correction fact tries to account for this), dyno operator, condition of dyno, etc, etc. As Dominic mentioned, bigger cubes will handle bigger cam(s) without negatives (to a degree). You can see this when you look at LS motors, the LS7 (427CI) has a lot bigger cam than the LS3 (378CI), but idles almost identically. You're only going to do this once (hopefully), so if you're in there you should really at least go up to a set of "stage I" cams. You'll really kick yourself down the road if you don't do it when you have the chance. I can't emphasize enough how streetable my car is with a 391 and stage 2 cams. I drove it home from Chicago to DFW, recently drove it from DFW to San Antonio and back, and drive it around town on weekends and never once have I regretted doing the larger cams (and this is with the tuning not being 100% finalized).
Either way one of Mark's 415s is great, but to me doing it with stock cams is like a buying cheap all season tires to put on your ZR-1 instead of high performance tires.
Either way one of Mark's 415s is great, but to me doing it with stock cams is like a buying cheap all season tires to put on your ZR-1 instead of high performance tires.
#14
Burning Brakes
Here’s my 415 with LPE B Cams (basically Stg III intake & II exhaust). The offset ground crank motors save the $5,000 new crank. The cams are a mixed blessing. I can say a good tune really makes a difference. I have a few early tuned cam’d cars that drive great at WOT. I’d seriously look at Pete’s 391 if you are going to drop it in your car & don’t mind cannibalizing your existing engine. Ted
#15
Le Mans Master
The same cams will exhibit differing idle qualities depending on the size of the motor. So Stage 2 cams in a 415 is close to a 5.7L w stock cams. Pete can show u a 427 w Stage 2 cams that idles like a stocker. The tuning is critical to this. I have Pete’s Stage 2 cams in a stock bottom end 5.7L and do my own tuning. It idles pretty nicely actually. Certainly more rump rump than a stocker but it’ll sit in traffic all day idling between 875-925. One of the beauties of DOHC. Don’t need all that lift and duration to make power up top.
As Evan said, stock cams in a big cube motor is like putting 245 tires on an 11” wide wheel, IMO.
As Evan said, stock cams in a big cube motor is like putting 245 tires on an 11” wide wheel, IMO.
Last edited by Dominic Sorresso; 05-14-2019 at 12:47 AM.
#16
Team Owner
Max gear for a 415 is 3.73s, IMO. I have 3.73s in my 415 (585 rwhp, 490 rwtq) and it is as much gear as our new tech tires can manage, and it still hits 200 mph at the top of 5th gear (my redline is set to 8000 rpm). I`ve owned a 402 with cams that had 4.10s and it absolutely needed the BFG drag radials to keep from lighting up the rear end in any of the first 3 gears. That particular car was pushing 510 rwhp and 465 rwtq.
Too much gear in a 415 and you`re constantly back pedaling the throttle to keep the rear end underneath the car - in the first 3 gears at least.
#17
Team Owner
The same cams will exhibit differing idle qualities depending on the size of the motor. So Stage 2 cams in a 415 is close to a 5.7L w stock cams. Pete can show u a 427 w Stage 2 cams that idles like a stocker. The tuning is critical to this. I have Pete’s Stage 2 cams in a stock bottom end 5.7L and do my own tuning. It idles pretty nicely actually. Certainly more rump rump than a stocker but it’ll sit in traffic all day idling between 875-925. One of the beauties of DOHC. Don’t need all that lift and duration to make power up top.
As Evan said, stock cams in a big cube motor is like putting 245 tires on an 11” wide wheel, IMO.
As Evan said, stock cams in a big cube motor is like putting 245 tires on an 11” wide wheel, IMO.
It`s all in the tuning. My 415 has big valves, stage III cams on the intake and exhaust. I instructed Marc to ensure it would idle like stock. It idles at 750 rpm all day long and has a seductive thump thump at idle. It can be done - just choose your tuner wisely!
#18
Team Owner
Here’s my 415 with LPE B Cams (basically Stg III intake & II exhaust). The offset ground crank motors save the $5,000 new crank. The cams are a mixed blessing. I can say a good tune really makes a difference. I have a few early tuned cam’d cars that drive great at WOT. I’d seriously look at Pete’s 391 if you are going to drop it in your car & don’t mind cannibalizing your existing engine. Ted
EDIT: I see that your power is dropping off around 7000 rpm. That`s the difference. I`ve got the big valves to go with the stage III cams - I`m pulling peak hp at 7600 rpm, with very little drop off after that (to 8000 rpm).
Last edited by DDSLT5; 05-19-2019 at 05:34 PM.
#19
Team Owner
Mark's website claims 600hp with stock cams. Not sure how reliable that claim is, but from what I read here and on thr ZR-1 net, he is very well respected.
I'm not racing this car and usable street torque is my primary goal. More cubes, more torque, as long as the cams aren't too wild.
I'm not racing this car and usable street torque is my primary goal. More cubes, more torque, as long as the cams aren't too wild.
With stock cams, the car will pass emissions, idle as smooth as a 350 cid motor. It`ll have HUGE torque and the power curve will be very similar to stock (surprise surprise), which means it`ll drop off around 6000 rpm, but still make reasonable hp up top. Between 3000 rpm and 6000 rpm it`ll hit like a ******* freight train!!!! Nothing wrong with doing a stock cam motor. Talk to Marc - he will explain it all in detail and put your mind at ease.
#20
Le Mans Master
With stock cams, the car will pass emissions, idle as smooth as a 350 cid motor. It`ll have HUGE torque and the power curve will be very similar to stock (surprise surprise), which means it`ll drop off around 6000 rpm, but still make reasonable hp up top. Between 3000 rpm and 6000 rpm it`ll hit like a ******* freight train!!!! Nothing wrong with doing a stock cam motor. Talk to Marc - he will explain it all in detail and put your mind at ease.