I am curious if anyone with turbos have done any internals to their Maximas? I understand that if one could lower the compression a fair amount this would enable the engine to handle more boost. I believe our 4th Gen Maximas have around 11:1 compression and lowering it to 8:1- would allow for more boost and in turn a super Maxima.

If anyone has done internals what is the best route to go by? I am very intersted in essentially "maxing" out the Maxima. I want as much power as possible without worrying about blowing the engine upon detonation. Any help would be great. Thanks.

 

tue anytime you want to run boost, you want to lower your compression ratio, if not say good bye to your engine.

 

you dont have to lower ur CR. ive seen peeps with 11:1 CR and are running boost. you have to boost more to make up for the power you lost, when lowering ur CR.

 

Thanks for the info regarding the internals. I know they do make stronger cams for the Maxima but its a matter of finding them and buying them. As for pistons and other internals, I am confident that I could get some and possibly get some time off to try this project. Thanks again and I'll keep you'all posted.

 

there are ppl on honda forums who have turbo'ed their typeR's stock MOTOR.. and those have high compression.

it's ALL in the tuning, with the honda camp that is much easier since there are 2 PNP EMS systems out..

with the maxima, EMS systems are all non-PNP meaning it;s a ***** to install..

 

Higher compression engines cannot handle as much boost as a lower compression engine can. Why?! The lower the CR the less of a chance detonation will take place, thus, causing engine failure and/or death (to the engine). I believe since the 300Zs had a CR of around 8:1+, 9:1 compression would be somewhat in the middle thus having the best of both worlds. Higher boost can be given and better MPG than if the CR was lowered anymore. I think this is highly possible to do for under $2000. Although, $2k is a lot to me. I need to get another job! Or find a shop who wants a test dummy. Thanks.

 

you can run boost without lowering the compression if you run LOW boost... thats why you dont see GSRs with stock internals pushing 20PSI and thats why you see Supras running 30 PSI

 

Buy the book "Maximum Boost" by Corky Bell. I'm not saying it's the ultimate word on turbocharging cars, but it covers all the basics. There are guys on this board running 10+ PSI and making 350+ HP at the wheels. For the most part, I think they're running stock short blocks. At some point you'll have to spend money to get that power to the ground which means clutch, trany and differential work.

As far as C.R. goes, thermodynamics sets the rules. Whenever you compress a gas into a smaller volume, it's temperature is increased. At some point it reaches the auto ignition temperature of the gasoline sprayed into the combustion chamber, and that's a bad thing. There are ways of cooling the intake charge with air-to air intercoolers being the most commonly used. Turbocharging is all about trade offs. Low C.R. allows higher boost, but kills power off boost. Large intercoolers can give lower charge air temp, but can add turbo lag. etc. etc. etc,

If you are a good mechanic and welder, and have a working knowledge of engine control systems, I'd bet you could turbo a Maxima for $2000 with mostly used/rebuilt components. My guesstimate is more like $5000+ if you want to be the system integrator and chief wrench turner with all new parts (like I do). I just happen to have misplaced my supply of spare G notes. So for now, it's all just mental masturbation.