GS023

Anyone have a link or discussion on what kind of RWHP the various years ZR1's actually make stock?

Thanks

lgaff

Usually 315-340 if I recall

Rkreigh

early years around 335 at the tire

later 93-95 around 350

due to the early ZR-1s being a bit lighter, there really isn't much of a performance difference

a few freaks out there did better but there are some happy dynos too so trap speed at the track is a much better indicator

FASTAZU

My 91 was 326rwhp bone stock 10K miles on it.

ghlkal

My 1990 put down 350 RWHP (WCF) before mods on a Mustang Dyno -- although it did have a Corsa exhaust on it.

oldpro

my 90 put down 332 stk with headers and exhaust 371. with coreys ported inj housings plenum and tune 409.9 .

GS023

Wow, looks like they respond well to very little mods.

With these being chip cars, what is the best option for tuning?

FASTAZU

That they do. I've had Marc H. do all my work.

I started at 326rwhp, After Long tube headers Corsa, full P&P and a Marc tune. I'm at 420+ rwhp. Still Have stock cams, cats & DM flywheel.

oldpro

since you live in texas i would go to corey henderson who owns henderson performance in new braunfells tx. he is the one who did all the work on my car. mark hibeck is good also but corey is alot closer to you .

GS023

Does the LT5 make for a durable track car ( oil temp, oil starvation, etc)?

jss06c6

Held the 24 hour speed record of just over 175 mph for a long time. LT-5 is a brute when maintained properly..

USAFPILOT

my 94 did 356 stock

Zrxmax

Its normal that racers put a bigger oil cooler on them though the stock oil cooler is big compared to most cars.

Take a look at the 11+ quart oil pan when you can. Its pretty difficult to have an oil starvation issue with the cover at the top of the oil pan. By design it keeps the containment factor pretty high from what I can see.

The highest I have ever monitored my oil temp is half way on the gauge. Not sure what the approximate temperature is... my best guess is low 200s.

Engine durabilty? Order a copy of the coffee table book, "Heart of the Beast". Also, over on the ZR-1 Net website you can read up on it there.

Its still the unofficial 24 hour record holder for a production car with a stock engine. VW has broken and then reset this record, however,

they never produced the car in numbers big enough for it to qualify as a production car.

GS023

Great information from all.

Thanks

Demps

I track a car that has done extremely well.
Ted

GS023

Found one downside compared to an LTX, weight. Looks like the LT5 is a least 150 lbs heavier.

Zrxmax

A heavier nose is good when you go past 150mph because dips makes the nose pitch.

8388

My 93 dynoed 372 with a K&N and Desert Development exhaust. Added a Doug Rippie chip, pulled the cats and dynoed 411 SAE.

For grins, we dynoed it with the valet key turned off, still dynoed about 360.

Never dynoed my 91 still (stock), but it doesn't feel as strong as my 93 did when stock.

Paul Workman

My stock 1990, save for a Borla cat-back (see graph) managed a 336.8 pull.



After porting alone, this is (more or less) typical with top-end porting, headers (and I believe sans cats) and a free(er) flowing cat-back...)



The same motor as in the top graph after full porting, except the TB, and free flowing exhaust and headers and tune...



with your comment about the LT5's responding well to porting. That's one of the truly exciting things about that motor! On the other hand, due primarily to its limited production, the supply of parts or especially trick parts is very expensive. However, if you read between the lines, it is clear there is significant potential therein, and experimenting and developments on their own motors (e.g., the latest "Voodoo" flat plane motor developed for the Mustang) is VERY intriguing!!

* Note: All dyno pulls shown performed on an inertia (Dynojet) machine, and measurements were actual values at the rear wheels