scavenging horse power!!!!

[jtwmechanic]

ok, since my m90 super charger on my L67 consumes about 65 hp to run at full potential i want to add a tubo to get back my 65 hp. what boost turbo should i run to compensate for the sc.

[tornado_735]

Sooooo....twincharge?

 

 

I approve of this, and am looking forward to it

[jtwmechanic]

i figure with the standard p&p to the heads and intake, cam, series III pistons, inter cooler, some other shit and a turbo to compensate the blower i might be able to make some real good power with this engine. i am a newbie to turbo's though and could use some friendly advice on how much boost i need and what compression pistons would be best for this setup. although a m90 to m112 swap has crossed my mind also with a turbo. any advice to my power combo is also welcome (pistons,cam ect.........)

[tornado_735]

Kuntzie would probably be the best source for information. I'd shoot him a PM if I were you.

[RobertISaar]

twincharging is unnecessarily complicated and is potentially less efficient than just a single turbo. there's a reason why cars don't come this way from the factory.

[Jonpro03]

I agree that losing the SC and adding a Turbo is the way to go.

 

But I have seen twincharged 3800's before.

[Euro]

There are twincharged 3800's out there...but IMO going turbo is way more beneficial for producing healthy numbers

[xtremerevolution]

Not that its all that difficult to make power using the M90. The whole parasitic loss argument is not really that valid when you consider that its making more power than an N/A configuration. However, if you are set on using a turbo, a single turbo would be the best bet. Just keep in mind its not going to be cheap, and you're going to spend a lot of money getting the plumbing done.

[jtwmechanic]

i agree, especially since kuntzie is making 430 on the dyno an expecting closer to 600 with his new turbo and cam. if i am going to do it the blower stays, waited a long time to have this l67 in my cutty and i am going to make it work for me, besides blowers are just cool and blown turbo'd cutty's are even cooler.

[jtwmechanic]

ok i am revising my plan, remember i said scavenging hp. i think it would make much more since to just intercool the blower and gain back my hp that way. since the blower is more for low end torque and turbo's are more for the mid to top it would only make since to have the blower by passed when the turbo kicks in for its duty. although i could just run a huge turbo and spin it up with nitros, certain sanctions won't agree with that set up. so i think intercooler to comp for the blower's hp usage. what do you think guys. it is also much cheaper than turbo set ups.

[Andrew]

i think the 65hp is on teh very high side of its parasitic loss. However, an intercooler is a very good idea and allows to you drop a few pulley sizes, thus getting more ponies.

Personally, i would start mods on the exhaust side, headers and a good downpipe. Then a intercooler, cam, etc.

[Addicted to eaton]

x4 cam, forged rods, forged pistons, New timing chain, Ported heads, Ported LIM, Stronger push rods, 150# springs, titanium retainer, intercooler, Ported m90, 2.9 pulley, headers, Tune, 103 AL, 160 t-stat, FWI, 2.6 pulley.... and enjoy some DAMN good numbers

[jtwmechanic]

i already have header, 3' custom downpipe , 2 1/2" exaust into 2 flowmasters, twins out the back like a gtp. it would be nice to be able to do everythiung at once but i think a cam, new lifters and roller rockers with the inter-cooler and a 3.4 - 3.1 pulley and a good dyno tune will be as much as i can afford this year. that should put me closer to 400 hp. i will probally go all out on my trans after that. no sense in building the motor if i am just going to scrap a trans because of it. the performance mods should cost somewhere between $1500 and $2000. the bottom end is newly rebuilt by me and has forged pistons (.030 over) and everything else is stock except that it has been balanced and should hold up to around 600 hp or more not that i will ever have that much. i just figured the 65hp loss off the fact that the m112 consumes 80hp at peak.

[xtremerevolution]

Any pictures of how you got headers to fit in your 1st gen w-body?

[jtwmechanic]

i live so far out that we survive on dial up, don,t laugh all you high speed bastards. i hope to have sat. internet soon so uploading pics is a pita. i havn't installed the header yet but its in the shop waiting its turn, i will either cut a releif in the fire wall via air die cutter and fill it back in accordingly (using the die cutter and riveting a prefabbed releif back in with windshield urethane eliminates the need to remove the dash and eliminates heat from the work area) i excell in fabricating!!!!!!!!!!!!! or i have a buddy that is awsome with bending pipe and can weld stainlees like a pro so we had contemplated cutting and rebending the header and using longer dog bones to tilt the motor a little. i think cutting and rebending the header sounds better, hell they only cost $205 if successful they would be pricless to me, i think that is kinda what milzy is going to do with wicked's header.

[xtremerevolution]

Quick question, did you need a walbro fuel pump for your swap?

[wickedbuick]

i live so far out that we survive on dial up, don,t laugh all you high speed bastards. i hope to have sat. internet soon so uploading pics is a pita. i havn't installed the header yet but its in the shop waiting its turn, i will either cut a releif in the fire wall via air die cutter and fill it back in accordingly (using the die cutter and riveting a prefabbed releif back in with windshield urethane eliminates the need to remove the dash and eliminates heat from the work area) i excell in fabricating!!!!!!!!!!!!! or i have a buddy that is awsome with bending pipe and can weld stainlees like a pro so we had contemplated cutting and rebending the header and using longer dog bones to tilt the motor a little. i think cutting and rebending the header sounds better, hell they only cost $205 if successful they would be pricless to me, i think that is kinda what milzy is going to do with wicked's header.

 

 

On my headers Milzy was going to bend a custom set from the flanges back. I am still in a tossup as if I'll get some speed daddys or go custom. It looks more like speed daddy due to money and just modding the car. Milzy cut the firewall on his 95 monteZ34 YEARS ago for some SLPs and it was very clean. He also used some longer dog bones to make clearance easier.

[xtremerevolution]

On my headers Milzy was going to bend a custom set from the flanges back. I am still in a tossup as if I'll get some speed daddys or go custom. It looks more like speed daddy due to money and just modding the car. Milzy cut the firewall on his 95 monteZ34 YEARS ago for some SLPs and it was very clean. He also used some longer dog bones to make clearance easier.

 

The problem with longer dogbones is the CV shaft angle changes as a result, throwing off your drivetrain geometry, and possibly contributing to vibration during load and premature axle failure. Due my Regal being lowered, Bob is actually thinking of getting *shorter* dogbones to fix the CV shaft angle, which would make his header fitment even more of a challenge. He'll probably get on that some time next week though so guys can probably take your pointers from him and decide what you want to do based on what he can accomplish with my car.

[jtwmechanic]

cutting and bending the speed daddy header is the way to go. i am positive i can make them fit nicely and if done correctly i will have no need for dog bones and no need to cut my fire wall. factory fuel pump will work fine until you have a need for more. i am still using my factory 3100 pump with no issues. i have 20+ years with a SAE certification in this field and will be glad to lend my knowledge if so needed but i usually keep my mouth shut, i don't want to be looked upon like a know-it-all asshole. i don't know why there would be any issue with your cv angle just by doing the l67 swap. there are no vibes what so ever in my cutty, stock dog bones w/half 96 cutty cv's and half 99gtp cv's to mate up with the hd tranny. all of the questions you are having are covered at motorswap.org from tranny to cv's to vibration issues caused by lowering.