time to build gentlemen

[KingNub]

I am getting shipped out for the Air Force Oct. 21stI am looking to get a Q45 about 2 months after i get in to build up on.I am doing a fully built motor and going with a large single turbo probably a GT42RS. Now I am aware there are places that build Q45 motors for boats. Now question 1 what kind of engine management would be able to handle the task of this scale and what place would be recommended for building an engine with low compression like all of that using iron sleeves possibly? Would sleeves be necessary for 800-900hp? I would be looking for 600 or so for DD and was figuring that having a large single would make it possible to not hit boost during normal street driving to keep fuel economy up. I am also looking to make the car as sleeper as possible using a remote mount turbo setup. Obviously for this power level I will be using a re-built Z32 transmission from Mazworx with their transmission adapter kit and a custom steel driveshaft.

But basically going back to my original questions, one what would be a acceptable engine management solution for my goals and two what would be needed on a build for this power level?

Thanks to all input!

[qship96]

The bridge between dream and reality is an expensive crossing with many pitfalls and potholes along the way.......most stop well short of making it across once the realities are revealed.

[gammer_ghn]

HMM... i have seen a couple of Blitz and AEM EMS units here and there but to be sure and honest you need to talk to our veterans like Q45 Tech, Wes, QSguy/ Shane and mettler his over in the VH45 section of the site. zeroforum/193. Wes and As far as seeking that much power with this engine a lot of custom parts are needed so you better have a CNC machine handy lol.

[TBrack]

2 months after you go to basic? more like at least a year maybe two depending on your job...

[ZenkiFactor]

This is my friend, he means he is going to buy a 1991 - 1994 Q45 then slowly build on it taking ~2 years, he will be working non stop and not returning for at least a year I will be doing R&D and help him build it from here in Florida. He may get a second one just as a DD or he might keep his Porsche 944.


Modified by ZenkiFactor at 9:08 PM 9/5/2008

[qsiguy]

The OEM ECU when modded is quite capable and infinitely tunable. With the right tools and software I'm not aware of anything you can't do. Yes, there are ECU's that may be easier to tune but the OEM one can do everything you need. As was stated above, there are some good threads in the VH forum where we discuss ECU options and a really good thread regarding the OEM ECU.

For the record, I really hope you follow through with what you are talking about. I've wanted to get my VH built for boost since I got boost. I'd love to up the boost to 20-30 PSI Oh ya!

[KingNub]

Another quick question....What's the max power ratings for the stock mass air flow sensor.I.E. When am i going to max out the voltage rating and move to a standalone?Also how difficult would it be to do twin throttle bodies? or would it be more effective to go with an ems?

[qsiguy]

I've come pretty close to maxing out the MAF during some of my testing at ~8 PSI of boost. I don't know the HP number since I have not had it on the dyno post turbo install. My guess is that you will max it ~450HP. I'm not sure what the actual rating is on it. I'd like to get some hard specs for it myself.

At the numbers you are talking about you may want to look into changing over to a MAP sensor.

[WizardBlack]

Most big turbo people go with speed density to eliminate any MAF, so that's really not a big issue if you use a standalone. I'd look at Wolf3D or AEM for a sequential ECU.The block is aluminum, so it already has sleeves. You really don't need to install new sleeves unless you want to (or have to) bore it way out. Neither of which is really going to apply to the VH45DE motor.AFAIK, Mazworx has custom designed CP pistons already figured out that uses a standard chevy rod (of some sort), so you can get forged rods pretty cheap. Contact Cometic for some MLS headgaskets. They are great about getting stuff custom made (or already having it). The only thing left is head studs and maybe a head port job. A custom plenum is pretty straightforward assuming you take some time to study them and know how to TIG.

[Q45tech]

The stock MAF has 7" H2O [1/4 psi] restriction at 6600 rpm and reads ~~ 4.4 volts which is a flow of ~ 420CFM.

I believe it tops out at 255 grams per second so you would need to scale transfer equation upwards and lose idle resolution.