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To make 500rwhp, you will have to deal with some extra lag whether you go single or twins. As mentioned, properly sized twins will spool slightly faster than a single, but not much. Now what you really need to ask your self is, do I want to make 500rwhp at 18 psi on pump gas or 24+psi on race...

What is wrong with putting a 7M in a 240sx. Low milage JDM 7M's can be had for little money, and there very easy to mod. I have heard the VG engines having just as many problems as the 7M's. You know the same kids that get ahold of them and run low oil, and 20psi on 87 octane. Its nice to see a...

I have been making well over 400rwhp for about 1.5 years. When I blew my metal headgasket running 24psi, I got a chance to inspect the top of my pistons and cylinder walls, and everything looked brand new still. 7M's are strong engines. The key is running plenty of race gas when pushing the...

THe oil lines are definantly a pain. It took me forever the first time to get them angled right. Once you get the oil lines situated, bolt-on the turbo, clock it properly making sure the wastegate rod is straight, then tighten all the "housing" bolts down. Install the accordian hose on(pray it...

Turn up the boost to 17-18psi. The SP61GT is practically asleep at that boost level. Your torque will be much higher and come on sooner with more boost. Also, take the engine to redline and you will noticee that the power does not die out at 5500rpm's any more.

My SPEC 2 held up to all kinds of abuse, at least until I shifted from 3rd to 2nd at 90mph at the track. My clutch feel is different now and I don't think its going to be able to hold at the track any more. I might be going for the horsepower freaks bronze clutch next.

The SP61GT uses the more modern GT compressor wheels from Garret instead of the older T series wheels.

I should be able to make it. Unfortunantly I dought my clutch will be strong enough for any dragracing. Maybe I will try anyway.

Quote: Originally Posted by MRSUPRA I did not notice what supporting mods you have, but do not get the SP61GT if you have not foumd a way do defeat fuel cut (at 12psi). THe reason I say this is because the SP61GT has a wastegate spring tension that will only allow you to run a minimum of...

Yes, it is very quiet, but sounds great. It took me a while to get used to it after trading away my Apex N1.

I did not notice what supporting mods you have, but do not get the SP61GT if you have not foumd a way do defeat fuel cut (at 12psi). THe reason I say this is because the SP61GT has a wastegate spring tension that will only allow you to run a minimum of 14-15psi. I think you will be happy with...

I still haven't seen any dyno charts for the Greddy 20G, but heard it spools very quick on the 7M while making in the low 400whp range. The SP61GT is a bigger turbo, but still has very acceptable spool for 180cu. engine. From my experience and seeing other dyno charts, the SP61 is not going...

I think there may be more to it than just the head not being torqued down hard enough. MK4's run 30psi on stock headgaskets with no issues. I ran 24psi with a Greddy metal headgasket and ARP headbolts, and lifted the head off the gasket. I beleive it was heat related more than anything.

I have run up to 24psi on my SP61GT using the Lex AFM. I do have a fuel cut defender wired in too, but I'm not sure if its helping me avoid fuel-cut. BTW, don't try this without having your engine dynotuned.

Did anyone do any measurement comparisons of the MAFT to the Lexus AFM as far as total sq inches.

If you are looking for a nice sounding quiet exhaust, the HKS Dragger, HKS 75mm sport, the Tanabe hyper Medallian, and the greddy SP are all good choices. I have heard the two HKS's in person and my car has the Tanabe. Too me the Tanabe is by far the best choice since its all stainless steel...

Stock for stock they are about equally fast. The MR2 has a slightly better power to weight ratio, but most healthy MR2's dyno at only 160-165rwhp, so they are slightly overated. The obvious advantage of the MR2 is its light weight and traction advantage because of its engine placement. But as...