I'm currently autocrossing an LS swapped 95 eg hatch in SMF(street mod fwd). As of right now the LS is stock with just bolt ons intake/header/exhaust running crome bolted to a freshly built gsr tranny with a typeR LSD. I'm not sure of the milage but it has to be near 200,000. At the end of the season I will be building a motor and going to the boosted darkside I also have a B18C1 on a motor stand in my garage that came out of my old GSR which I rolled. there was 151k on the motor when it was pulled. Which would you use if it were your choice and why? As with many folks I have budgetary concerns and would like to keep the build at or under the $3000 mark including a decent turbo kit with a goal of 250 to 300whp. I thought that maybe selling the gsr motor would help fund a high quality LS build but I'm up in the air. Would one be more dependable than the other? the car is becoming primarily a race car but does see some 2hr drives to events. Yes I've searched and read many gsr vs ls turbo threads along with many other turbo related threads but I wanted to put my question out there for some fresh up to date feedback. I'm new to the world of boost and hope to get as much advice as possible, thanks in advance.

 

151K and 200K is splitting hairs. Either one will take abuse on autocross in which the unknown will occur at that mileage. Building either B18C1 will be in your best interest for autocross, but forged internals including pistons and rods will need to be in order for your use on autocross.

That's not going to happen, even with people trying to advocate for the use of quality used parts to piece together a kit. $3000for both the build of the engine AND the turbo kit is not realistic at all. Your budget will need to increase to about $4000 to $4500 to do it properly, and that may possibly include a better clutch, fuel management, and tuning.

No, but the characteristics will be different between the two engines for power, torque and usability. For Autocross, turbo will cause a lot of front end dive and little use of the power (unless you're confusing autocross with HPDE road racing) for either engine type. Pick one and stick with it based upon your budget. check the LS Turbo forums for setup ideas. GS-R turbocharged setups are just as common, but its based upon what you're trying to do here.

Those same links you found give pretty much the same information. nothing has changed except for the availability of certain kit types and usability.

 

You want some sound advice? Do some research... it helps to read the FAQs...

Order number 198,785,513,032 has been served.

 

I run smf also.

If recommend building the gsr swap and going with a quick spooling responsive turbo setup at 350whp.

 

Well you have a Ls motor and a GSR motor. I would take the best of the 2 and make it one, LS Vtec. Use the Ls Block for the longer stroke and thus more tq and the Vtec head for top end power and a better performing head. My Ls Vtec motor is a thing of beauty, pulls like a bat out of hell.

 

thanks a ton, any input is much appreciated. I'm leaning toward building the GSR motor over the LS and I figured the Budget was wishful thinking and certainly not based on real math. Currently in the process of house shopping so money is going to be tight this fall/winter. Not too worried about "nose dive" or any other handling changes, just went to 700lb springs and I'm totally happy with the weight transfer characteristics at this point.

I figured there was an absolute certainty that someone would jump on here and tell me to do more research or check the FAQ and believe me I have and will continue to research the subject til my eyes bleed but as you can see I've been a member of the HT community for a while and make it a point to read more than type/speak. Just figured I'd put my feelers out there and put it to a live question/answer. Sorry if I inconvenienced anyone by causing them to scan over a redundant thread.

I feel if I try to go much over 300hp I'll be running in to dependability and traction issues, as of now I am only running on 225 wide Hoosiers but I'd like to be on 255 or even 275s next year. Do you think it's going to require 350whp to be nationally competitive? Just a question, I'm still learning the ropes in SMF. Honestly up until recently I thought I could be competitive with a 200hp NA build. I would guess I'm currently putting 125hp to the ground and in the Philly region we have a supplemental street mod/street tire class which I usually finish top 5 of 15 cars but a few weeks ago at the national tour event I got my @ss handed to me one position away from dfl. I know there were a lot of factors that determined that outcome and horsepower was probably the least of them.

thanks again for the advice