Hey guys I think I have a line on a ZZ3 forged crank and Eagle h-beams from Engineer Mike. I've been looking for Pistons and having trouble. First off I'm new to the bottom end stuff and Definately new to the SC. Trying to do the rebuild BEFORE I blow the motor

First off setup

S-trim with probably a 10-12# belt
Ported heads (with quite a bit out of comp chamber)
Hot cam
1.6
Shorty headers
24# injectors

Fuel

Inline NOS 3196? pump (its the good one)
Probably a racetronix walbro 340 in tank

Am I right to be thinking of 8.5-9.0 compression ratio for 92 octane gas??

GOALS: Nice street car with about 450RWHP-500, pass emissions, maybe high 11's on 17 inch drag radial (probably dreaming there

I've been looking at the TRW\speed pro 21cc dished piston. Would these be a good choice? Too Heavy? Durability?

Also looked at SRP but that is more money for my goals do I need to step up?

Tried to give all the info I can but if there is anything I'm missing please let me know. After I get the pistons decided I'm going to have to ask about rings

Thanks,

Bobby

 

Forgot to say budget is a main concern hence my probably staying with the hot cam if my goals can be met with it! Also baring any catastophys( I know they happen) I'd like to get 20-35K before next tear down.

Thanks again!

 

Why a NOS in-line pump?
If you get a high-pressure in tank unit that is all you should need unless you plan on running insane fuel pressure?

As a note, NOS, Vortec, Paxton, Accel, NX and many other companies that sell in-line pumps for the most part use either a Walbro GSL392 (255L/Hr high pressure) or an Airtex T-Rex which is about 200L/hr.

Racetronix stocks the Walbro GSL392 as well as special adapter fittings for rubber hose, -6AN, -8AN among others. Universal and application specific wiring harnesses are available. The Racetronix harnesses are superior quality (in most cases other companies supply the raw material and you must assemble your own non-weather-proof harness) and less expensive.

Jack
Racetronix

 

I got it with the kit It is actually a Bosch unit they included them with the NOS kits at first but I guess they were too expensive so they went with a cheaper one. So the intank will be enough? Is that plug and play Walbro 340 what you are referring to? I was planning on getting it anyways since the stock pump with 85K make me nervous!

Bobby

 

Correct the HP system is based around a modified 340.

 

Quick (for a change) comment: 24# injectors will be too small.

Rich Krause

 

Hey Jack whats the deal with the GSS346? Is that pump better or worse than GSS340? Just wondering.........


93 TA you will need some 42lb injectors unless you wanna run FMU.

 

The GSS346 is Holley's part number for the GSS307 which is a lower pressure capable pump than the GSS340 (Holley = GSS349). You will pay more for the Holley branded pump

Jack
Racetronix

 

I know the 24# (they are SVO's) are small, I would love to ditch the FMU. I have Alvin with PCMforless do the tuning and he says with the speed density I have to use it I would love to convert to a MAF system just to ditch the FMU! But I'll have to wait until I can afford a FAST or DFI.

I had a post of converting but no one seems to know how hard\easy it would be.

So any suggestions on the pistons?

 

Why does running a SD system require a FMU???

Upsize the injectors and use a 1:1 FPR and tuning will be much easier. Your pump volume will increase and your injectors will have an easier time opening due to lower FP's.

Jack
Racetronix

 

Jack,

Now you have me interested! Do you carry the FPR as well? The problem I have is getting it tuned. There isn't any chip burner tuners here in the NW.

Bob

 

Perhaps you should consider buying Tunercat and the required hardware to tune you own car? For what you would pay someone else you could easily buy the items to do it yourself. There are many support forums on tuning GM ECM's. Eventually you will get fed up dishing out money to get it right. You might as well start learning how to D-I-Y now.

We do not have any LT1 FPR's however we are looking at carrying them in the near future.

Jack
Racetronix

 

The TRW/ Speed Pro pistons you stated earlier will get you to the HP level you want. I'm using them, going on a year and a half now, and I have 2 friends who use them and they will work fine.

Bill

 

Thank you very much! Wanted some real world experience Its so easy to start adding a couple hundred for better pistons, then a few for a crank etc I just want to keep costs down with accordance with my goals and not go overboard

Bobby