shoreice Posted August 24, 2006 Share Posted August 24, 2006 I've been reading back posts for about a week now and see turbo projects and blower projects but no old fashioned hot rod projects. Did anyone try the cam, roller rockers, hi-comp piston thing? We seem to have a source for custom prom chips so that should not be a problem. How much horsepower is the stock transaxle good for anyway? Link to comment Share on other sites More sharing options...
Guest F14CRAZY Posted August 24, 2006 Share Posted August 24, 2006 I am considering the 1.8 rockers from seriesoneperformance.com. Thing is, they're pretty expensive, and I get more power from like an underdrive supercharger pulley. Eventually, when my other ways of more power are used up, I may have to resort to rockers.From what I know, the motor has to be pulled for a cam.My compression is pretty high already, since L67's had lower compression, and I've got boost.Hard to say what the transaxle is good for. The 4T60 was decended from the 440T4, which was made for 2.8L applications, which was decended from a 3 speed. A supercharger is going to make torque at lower RPM, which is bad for the transaxle since they're able to handle power much better with higher RPMs. A turbo, on the other hand, has more in the higher range. 2seater has been running his 260-280 hp setup and the transaxle has held up well, though he rebuilt it before the mods (I think, can't remember exactly). My proposed 6 speed manual project will eliminate most all worries though <img src="http://forums.aaca.org/images/graemlins/grin.gif" alt="" /> Link to comment Share on other sites More sharing options...
shoreice Posted August 24, 2006 Author Share Posted August 24, 2006 motor first, than extras. If you are not breaking parts you're not making enough power. 6-speed manual will hold lots more hp than stock auto. Link to comment Share on other sites More sharing options...
Guest crtnrds Posted August 24, 2006 Share Posted August 24, 2006 F14 - What size S/C pulley did you use? How much difference did it make? Link to comment Share on other sites More sharing options...
padgett Posted August 24, 2006 Share Posted August 24, 2006 Reading all of the TSBs it sounds like every year something in the 440T4/4T60 transmission was made bigger/stronger/more so the best ones to find are the 1991s.According to GM, their remanufactured transmissions get all of the beefier components so for $1200-$1500 (trans only) is probably the way to go.As to how long they last, it is not really how much horsepower but how well you control it. Axle tramp or getting one tire spinning on a slick surface and pullin onto dry will tear up any transmission. Avoid wheel spin and they will last for quite a while. Link to comment Share on other sites More sharing options...
Guest F14CRAZY Posted August 24, 2006 Share Posted August 24, 2006 It's the stock pulley size, to start out. I am developing around 200 hp, maybe a bit more or less. I need to take it to a track and/or a dyno, or at least borrow a G tech Link to comment Share on other sites More sharing options...
Guest EDBS0 Posted August 25, 2006 Share Posted August 25, 2006 Fast enough for you? Link to comment Share on other sites More sharing options...
Guest crtnrds Posted August 25, 2006 Share Posted August 25, 2006 That doesn't look much like a Reatta. If it didn't say Buick on the side, it could be just about anything. Link to comment Share on other sites More sharing options...
shoreice Posted August 25, 2006 Author Share Posted August 25, 2006 Thats a little more like it. maybe it says Buick across the tail lights too. Link to comment Share on other sites More sharing options...
2seater Posted August 25, 2006 Share Posted August 25, 2006 I am still using the stock 121k mile trans at this time, no rebuild done when the turbo went on. Transaxle holds up okay if treated with some respect. It is serviced regularly, and has a large trans. cooler. I figure, if you break it, then you fix it. My compression is really too high for the turbo also, even higher than stock @ 9.1:1. The original intent was as you mentioned, old school hot rodding. Raise the compression, port the heads etc.. That worked pretty well, fuel and air flow readings indicated in the 185-190 hp range. More cam to extend the useful rev range would probably yield around 200 hp. Added the turbo before the cam or rockers were investigated, and not much existed several years ago when the turbo project started. I have been detoured from the car project this summer by other things, but off and on, I am investigating adding an intercooler, re-orienting the turbo for a couple of reasons, changing to a 3" MAF (55% greater flow at the same frequency) and changing the flow pattern inside the manifold on the flow bench. Link to comment Share on other sites More sharing options...
shoreice Posted August 25, 2006 Author Share Posted August 25, 2006 2seater. thanks for the straight answer. I was looking at cam, head work, and larger injecters for a solid 200hp. I understand turbos work well at about 7:1 cr. Link to comment Share on other sites More sharing options...
Guest F14CRAZY Posted August 25, 2006 Share Posted August 25, 2006 My bad 2seater. Too many stories to remember <img src="http://forums.aaca.org/images/graemlins/grin.gif" alt="" /> Link to comment Share on other sites More sharing options...
Guest EDBS0 Posted August 25, 2006 Share Posted August 25, 2006 It is ...Using a more conventional Buick Reatta body in 1988, Bernstein tied Don Prudhomme's once-untouchable record of four consecutive Winston championships, Link to comment Share on other sites More sharing options...
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