widebody350

iTrader: (1)

I've decided to finally build my motor and I'm willing to admit that I'm not up to date with all of the new FI products/formulas for a high hp Z, so if you all could throw your opinions/suggestions out there I would appreciate it...I'm shooting for somewhere around 600whp and the car is an 04 btw.


I'm thinking of going with FP's S1 block, with ARP L19 headstuds, Cosworth headgaskets, BC 264s, CJM Fuel Return, Deatschwerks 850cc injectors, Haltech engine management, and Cosworth intake manifold.--Greddy kit w/ FMIC.

Thanks.

str8dum1

iTrader: (11)

with almost 2000 posts, one would assume you know how to hit the search button, or browse the shop builds section.

If you are ready to drop 30,000$ doesnt it make sense for you to do some of your own legwork?

but yes, thats all fine equipment, but get a HKS headgasket

NismoZ123

iTrader: (2)

Bwhahahaaaa.

A.D.D.?

widebody350

iTrader: (1)

I have searched and that is what lead to this build...just seein if people who are more knowledgeable think this is a good/safe way to achieve my power goals, and/or if there is a better way to get them. Why HKS over Cosworth on the headgaskets?

IIQuickSilverII

iTrader: (13)

either is fine.... take cosworth cause i think its a bit cheaper

XKR

iTrader: (1)

if you are buying a short block from FP.... Why don't you ask him what you should go with? As far as gaskets... Most will say HKS because it's well proven to be one of the best ... If not the best.

Zivman

iTrader: (19)

I have HKS gaskets in my build (cosworth weren't available then).... my buddy has cosworth gaskets. His car spikes to around 17 psi (APS TT)... but more or less runs around 14-15 psi. He was at the track last weekend with it and made 22 passes without issue with the cosworth gaskets. Times weren't so good, ran a 12.37, but was trapping pretty decent at 117-119 mph.

I don't know if the cosworth manifold is worth the money, but everything else on the build looks good. Have you picked out a clutch?

ttg35fort

iTrader: (2)

Ditch the Cosworth head gaskets. At least some Cosworth head gaskets appear to be re-branded Cometics. Now use the search feature and see how many people have had issues with Cometic head gaskets over the years on FI builds. Now, I'm not saying that everyone has problems with Cometic head gaskets, but far more people have problems with Cometic head gaskets than HKS head gaskets. In fact, I don't recall ever hearing of a problem with an HKS head gasket. I heard of another Cometic head gasket failure within the last month or so over on the G35 forum. Search for the terms JTrain and Cometic, and you will find the thread.

Everything else looks fine. It will be a nice setup and should easily make 600 whp.

binder

iTrader: (8)

850cc injectors are overkill for 600hp. People are easily making mid-upper 400's with 440's and a lot of TT kits include 600cc injectors since that's all they will need.

ttg35fort

iTrader: (2)

After he has been at 600 whp for a while and decides he wants more, he'll have some head room. With the proper octane fuel or meth injection, the Greddy TT kit will get him well in excess of 600 whp. So, imo, the size injector the OP chose is very well matched to the TT kit.

EDIT: For context, I made over 600 whp with my greddy 18G kit at 17.5 psi with really, really conservative timing and AFR for pump gas. Even then, I had a lot more head room available with the Greddys. Alberto indicated that he is at over 650 whp with his Greddy kit on pump gas (I'm assuming it is the 18G kit, but I could be wrong). If the OP wants to run higher octane fuel, there certainly is more hp to be had with the 18G turbos. Then again, he may be using the 20G turbos, which will provide even more air flow. So, imo, stick with the 850cc injectors. Roger at Japtrix got my 1000cc injectors idling and running beutifully. The tune may take a little more time than if they were tuning with a smaller injector, but a good tuner will get those DW 850cc injectors smooth as a baby's @ss. Indeed, off the top of my head I can name a number of tuners who can do it. Just don't go to Fred down the street that has never seen a VQ motor before.

binder

iTrader: (8)

ya, the headache of tuning is why i would stray from them unless i was using e85 or something that required more flow. Goal being 600hp the ease of tuning would outweigh having bigger injectors if i was to choose them. He doesn't say what he plans on doing with the car but an assumption would be street driven if he's limiting it to 600hp.

ttg35fort

iTrader: (2)

But what happens when the OP decides he wants to add meth injection or run race gas and get 650 or 700 whp. He will already have the turbos to get it done, but now he will have to go buy new injectors... I've been through that scenario too many times. So, from experience of having been through this before, OP you should stick with your 850cc injector selection. If you want smaller injectors, youi might as well get smaller turbos, which will still get you to 600 whp, but give better low rpm torque too.

binder

iTrader: (8)

true true. i wo'nt disagree there.

i'm currently putting my car through rehab and doing the whole "built motor turbo" after doing a supercharger setup just 6 months ago. goals change i guess.

Cass007

iTrader: (34)

I agree that the head gasket should be changed. I am using the L19's with the HR gaskets - very economical and holding 600+whp so far.

The Cosworth Intake will flow like a ****, but crushes a wallet. You can get the power you want with an APS Tallboy or a 5/16" spacer as well. Keep the 850cc DW's, you will need them.

Finally, the Haltech is great, but if you are considering using F:T as your tuner (since you are in VA) uou should talk to Dave about the ViPEC. It costs about the same and has more features, plus my tune is very drivable around town and super smooth.

IIQuickSilverII

iTrader: (13)

i hate commetic and so does my builder for ovbious reasons....the cosworth i have is nowhere similar to that one....where did you come up with that case of a cometic gasket rebadged as cosworth?...are you sure that wasnt a comfusion?.....did that gasket failed?.....

just wondered, sounds like a bit of jumping the gun if you are just going of a single "case" anyways.....so far i have never seen an issue with the cosworth gaskets (buildings actually put a cosworth gasket and not somethign else they try to make it pass) on builds i am familiar.

Cass007

iTrader: (34)

My understanding is that the Cosworth gasket is "thicker" than the other gaskets and is the go-to gasket if the heads have ben re-decked more than once and clearance is very tight.

HKS gaskets work, no discussion on that, but they are crazy expensive. The HR gaskets are like 1/3 the price of HKS and have also been proven to hold power with stock TTY headstuds to ~15-17lbs (per Kenefic) and well past that with the L19 headstuds. I will find out first hand if they last at ~25lbs boost when I crank it up in the spring.

ttg35fort

iTrader: (2)

^^^^

Keep us informed Chris. I'm still debating between the HKS and HR headgaskets myself...

Zivman

iTrader: (19)

if it were my car, I would get the HKS over the HR

IslandZavage

iTrader: (8)

im doing the HKS gasket (get what ya pay for and i want PROVEN).. I only want the expense of building my motor right the 1st time around..

ttg35fort

iTrader: (2)

If the HKS had the same coolant flow configuration as the HR, it would be a no brainer. But you are correct, it has not yet proven itself. I still have a little time before I have to make my final choice. I'll follow up with Sam to see how his high HP builds are holding up. I think he is mostly using HR headgaskets.