Mohammed

We bought a '91 ZR1 not in a good condition.


we want to make it street/drag car , And planning to remove engine+transmission and swap for something with serious HP. something in the range of 600-700hp


What do you guys recommend for a budget of $27K


1- Engine ? Crate engine ? which block ? other options ?
2- Transmission ?
3- Rear end ? What rear end will hold that power ?



Your help is appreciated

joelvette

iTrader: (11)

what do you want for the old tired engine tranny combo?

vazfx16

Honestly, with a budget of $27K, time and know-how, I would do a built turbocharged LQ4.

3.8redbird

iTrader: (3)

The rear is going to be the most expensive conversion. There are very few people putting over 600rwhp to a D44 in a c4.

Drag racing kills them so you would want to go sra.

HioSSilver

iTrader: (8)

I'd turbo the ZR1 engine and run it off a Motec for that money.......I could even give you change back.

Mohammed

You mean the price ? Haven't decided yet


Why LQ4 ? What about ls3 ? ls7 ?


I'm not sure if there are rebuilt D44s that can hold that HP. Maybe my last solution is a straight axle.


lol , not planning to work on the lt5. LS engines are easy to mod and more common

I don't want to be ending searching for someone who knows how to work on lt5.

badformulaLS1

iTrader: (1)

I think it would be cool to build the LT5. Not something that's common. I understand it being more difficult though.

3.8redbird

iTrader: (3)

You can recoupe $5000+ if the LT5 and trans are in good condition.

There are cryo treats pumpkins and ways to make them live but I have yet to hear of any living long with 1.4-1.5 60fts.

There are "kits" to backhalf the vette but they are expensive and require cutting.

If you were going autox/roadracing the rear can live. It is just the repeated hard launches that gets them.

vazfx16

LQ based on price and availability. The LS3 or 7 will eat half your budget for the engine alone. LQ would be a fraction of the cost, then can be bored and turbo'd. You could reach your power goal with room to spare. Depending on how it is built you probably could get 800hp from it.
Example: https://ls1tech.com/forums/conversio...uild-swap.html

Grr

iTrader: (2)

ERL 427 or 434 NA superdeck shortblock
Edelbrock 245 or TFS 245 heads
super victor EFI
turbo 400
PTC converter

Should make the power you are looking for and fairly cheap.

Mohammed

I need something fast and reliable , not something uncommon lol. LT5s are rare and expensive.



http://www.zr1specialist.com/HAT%20W...20upgrades.htm


Not a good plan though !



Interesting ,so the lq4 block is good for these kinds of power ! what about the lq9 if you were talking about availability.


I will put this among my options , another noob questions. How do I know which stroke will be good for my setup ? Forged internals ,cam , ported heads and a supercharger looks like a good idea ? right or not ?

I will save that link for future. Thanks



I had to google that , first time I hear about ERL performance. Easier to buy a built short block than buying the block only. But need to read and search more about this.

Can you clear some of the stuff there ?

There are NA and superturbo packages , if I'm planning for a turbo or a supercharger , I should go with turbo packages as they have a lower CR ?

Rick Speed

iTrader: (55)

First off LQ9 and LQ4 the same exact engines the only difference is the piston design. So if your doing a purpose built engine in the end it won't matter. Supercharged and Turbocharged engines both require low compression. A nice forged low compression LQ4 can net you over 800 rwhp easily

vazfx16

LQ9 is higher compression. So you would be undoing part of the main benefit of the LQ9. You g
Could run LQ4 on forged parts and stock compression, which should make the parts more off-the-shelf=cheaper.

vazfx16

my understanding is that the ZR1 Yamaha/Lotus derived top end is made of glass

Grr

iTrader: (2)

If you are planning a turbo or blower you are going to be way over 6-800hp. What I ped up there should make around 700whp on gas the way it is.

brewster240

iTrader: (1)

sell the zr1 to someone who appreciates what it is, and get a one of the 900 regular c4 on craiglist for cheap.

LOHRTBT

iTrader: (12)

Winner!

vazfx16

I was thinking the same thing this morning.
The zr1 tech is a work of art.
I am sure a collector would want the car

Danspeed1

iTrader: (1)

I think doing something different, would be to keep the LT5. Have you driven this car yet? That engine is an amazing piece of machinery. I had the opportunity to drive a stock zr1 once. I actually was trying to buy it from a local dealership but they couldn't secure financing on it. The engine omits one of the most musical sounds I have ever heard, and the power feels endless.

Before removing that motor I would contact Jeff at Pacific Northwest ZR1. He builds someone of the fastest ZR1's in the U.S.

DG

Mohammed

Thanks for making this clear





I own a C4 , so what is a C4ZR1 worth to me !! Can't argue about the value of those machines, But that car needs a lot of work on body and interior, selling the engine and transmission will give me some good cash.


and in the end ,it will be a faster ZR1 with a better engine !!!