Is the new SLP "low compression" 402 going to good enough to support 10-14 lbs of boost or should I look else where, any thoughts or advice ? Thanks


Doug
'00 T/A
Mods-

 

I asked that same question to one of the sponsers on this board he told me that i wouldnt get that motor...especially for FI he said it would take around 6psi and its really not worth it.

 

That can't be true, the stock bottom end will take 6psi and the SLP package is fully forged.

IIRC the SCR on a SLP 402 is 8.5? If that is the case, you should be fine on 9psi of intercooled boost with pump gas, and much more on race fuel.

 

i smell bs. forged wouldnt be weaker than stock... plus they use good forged stuff not jus ebay specials..

 

it is a lot of money to play with but we all would like to know. not many want to try it though which might say somethin. It should handle way more than stock though.

 

IIRC that block came with Eagle Rods, Eagle crank and JE pistons.

Its safe to say that it WILL hold up without seeing it in action.

I got my short block from HPE though, and it will also hold up to boost.

 

I would like to know more opinions as well

 

I have a 402ci LS2 motor in the shop going in a Procharged Z28.I see no problems at all.

 

The 402 ls2 with the proper forged setup and compression will be perfect for FI. Its no different then building a 408 or other FI type application. Why would it be?

 

My question is more about the builder than the cubes

 

I am very biased towards HPE because that's who is taking care of my engine needs. At the very least, you should call HPE because they are so thorough about every aspect of the build and are willing to talk and explain anything that you don't understand. Their head engine guy, Eriki Koenig, teaches how to build engines for a living and has built some incredible stuff. They have great prices and are a sponsor to boot! An iron 398 with forged everything + coated pistons is costing me around $4400 and this thing is capable of handling 1500 hp!! Their regular price for a 408 is like $3899.



Greg

 

ahhh now I see what your getting at. The 402 I know getting done is from SDPC not slp. I had my 408 iron done by APE with the strongest stuff they offer and capable of 1500hp for under 5k

 

I agree, Erik is very helpful, he always explains stuff to me even after I purchased my motor.

 

In theory it sounds like the low compression SLP 402ci would work. I would contact them or their distributors and do some research. If they use JE pistons, maybe find out if they are reccomended for forced induction.

 

Thats just what the sponser told me he said he wouldnt go over 6psi with that motor...so dont yell at me just passing along the info

Oh and Btw the person i talked to was a distributor

 

The SLP Motor should be fine!

 

Is it true they dont have a warrenty at all??? At least that is what i read....... I am VERY VERY happy with my purchase from APE and i KNOW Chris backs up his product.
Kyle

 

I really don't trust SLP motor's at all.We've used alot of APE motor's and they have all performed better than expected.We are ussing a SDPC LS2 402 with a D1 shortly.There will be no problem running 700-750rwhp on this.

 

yea i never implied that a 402 wouldnt be a great engine for FI. I just havent heard of to many guys with great sucess stories of SLP. From what i hear they do a lot of business though so that should mean somthin right? slowhawk when do you think yours will be done? Id love to eventually go with an ls2 to stay aluminum but i heard that there isnt a very good aftermarket for em such as cams and stuff
jesse

 

The issue with holding up to boost is relative to how much abuse are you expecting from that motor. That's why it's rumored only 6psi for the SLP builds. There is probably some conservative truth to that. Call a few reputable shops around the country, W2W, Thunder Racing, to name a few and they cannot touch the SLP price....why? Because they are meticulously building their race engines. Balanced, Blueprinted, Spec'd, and documented every step of the way. It's the labor in the building that drives the cost up for good reason. If you look at the SLP cost it barely covers the part costs (if you added everything up). If you just "assemble" the parts (which is probably what's done) it will probably be a reliable NA motor and maybe handle some brief abuse with FI or Nitrous, but If your looking for big FI HP numbers or race type abuse the extra $1-2K you will spend is money ahead for good parts and a meticulous build.

I'm by no means an expert but unfortunately a voice of experience. $3300 first time, 500 miles later and 15 PSI on a dyno is costing me an additional $4000. Do the math.