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92 ZR-1 on the dyno today

 
Old 04-27-2019, 05:59 PM
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Default 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.
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Old 05-02-2019, 01:33 AM
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That sounds about right for an all stock car. Question is do you want to wake that puppy up or are you going for the whole NCRS thing?
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Old 05-02-2019, 06:30 PM
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Originally Posted by ZWILDZR1 View Post
That sounds about right for an all stock car. Question is do you want to wake that puppy up or are you going for the whole NCRS thing?
Once the "War Chest" fills up, it will be off to Mark for some more cubes......
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Old 05-03-2019, 12:50 PM
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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.
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Old 05-03-2019, 07:07 PM
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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......
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Old 05-06-2019, 04:33 PM
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Mine is also a 92 and with a little work, you can give them a good surprise. Top end porting, headers with cats and a Corsa gives good results.
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Old 05-06-2019, 08:09 PM
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Originally Posted by Subfixer View Post
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......
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.
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Old 05-08-2019, 04:34 PM
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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.
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Old 05-08-2019, 07:17 PM
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Originally Posted by Evan70 View Post
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.
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....
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Old 05-09-2019, 05:24 PM
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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.
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Old 05-13-2019, 12:14 AM
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Originally Posted by Subfixer View Post
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....
It seems to me to be a bit of a waste having 415CI and using stock cams to try and fill those cylinders. U realize that a larger motor can tolerate a bit more cam and still run smoothly. Iím using nearly the same cams Evan has but in my 5.7L. Motor idles fine at 875-925. Very tractable around town.
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Old 05-13-2019, 05:28 PM
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Originally Posted by Dominic Sorresso View Post
It seems to me to be a bit of a waste having 415CI and using stock cams to try and fill those cylinders.
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.
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Old 05-13-2019, 06:16 PM
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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.
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Old 05-13-2019, 07:28 PM
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Hereís 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 camíd cars that drive great at WOT. Iíd seriously look at Peteís 391 if you are going to drop it in your car & donít mind cannibalizing your existing engine. Ted
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Old 05-14-2019, 12:46 AM
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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.

Last edited by Dominic Sorresso; 05-14-2019 at 12:47 AM.
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Old 05-19-2019, 05:28 PM
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Originally Posted by Subfixer View Post
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......

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.
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Old 05-19-2019, 05:30 PM
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Originally Posted by Dominic Sorresso View Post
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 Peteís 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 itíll sit in traffic all day idling between 875-925. One of the beauties of DOHC. Donít 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 11Ē 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!
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Old 05-19-2019, 05:33 PM
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Originally Posted by Demps View Post

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
Teddy - you need 100 octane for 563 rwhp? Did you do big valves? I`ve got big valves, stage III cams intake and exhaust - 585 rwhp on pump gas (93).

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.
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Old 05-19-2019, 05:38 PM
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Originally Posted by Subfixer View Post
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.

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.
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Old 05-19-2019, 06:27 PM
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Originally Posted by DDSLT5 View Post
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.
Thatís impossible. Everyone will tell u that DOHC motors simply donít make any torque until well above infinity rpm.

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