Contour Enthusiasts Group Archives Forums Modifications Duratec Performance Whats going on with the turbo Mr. Hightower was working on???

You guys need some boost!

It's still on hold. I actually spoke with them yesterday, and they seem optimistic about having parts soon. The turbo we will use for the Contour is also used for other applications. They have two different models. They have no supply problems with the smaller unit, but the smaller unit isn't big enough for the 2.5L Duratec. Believe me, I am pretty anxious, too.

Chris,
Email me off list, theres a place here in Austin, that supplies Super60 converted VNT25 Turbo's with 360 degree center thrust bearing. I might be able to help you out with something, or at least you can pick my brain. Keep up the work.. I'm anxious to see what comes out of this

Super 60 wheels would not supplies enough CFM. I've used them on 4-cylinders myself. Even too small for those IMO. (well my last 4-cylinder was 2614cc - that's a BIG 4!)

With high compression we'll need a larger compressor to be run at lower psi (less heat & working in the safer area of the compressor map)

Burntgnat- that sig. is from Dumb and Dumber, right?

Hey guy's what's up? I'm just going fishing here but Why not see what other 2.5 liter guy's are using for turbos. I know the 93-97 Probe GT's have a single and twin turbo kits and they have a Mazda 2.5 liter engine. Just thought it might help. I'll find out some info on the Probe board. I know a guy that posted on this forum who owns a single turbo probe named bigprobe on the board. Maybe we could ask him. Just trying to add to the excitment for a turbo for our SVT's.

i too am getting anxious!

Demon,
I am wondering why you say a Super 60 Wheel would be too small for this application? I remember Chris saying that he was going ot be using a ball bearing Variable nozzle turbo, and I didn't know of anyone out there who made this with a wheel larger than a super60. Using the following calculation, at 10psi(which would probably be the limit for these engines if you are lucky!), assuming a .93 VE for the duratec and assuming a 100% intercooler efficiency(for simplicity.. it would probably be lower, thus the Airflow ratig would end up lower.. but I digress).. you would get the following:

At 4000 RPM :
((4000*0.5*0.93*152)*(14.4+10)/14.4)/1758
This would yield 272.5cfm, with an Airflow rate of 19.07 and a PRessure ratio of 1.694.
Now do the same thing at say 6000RPM,you get 408, 28.61, and 1.694.
(Trust me on the Formulas/figures, a friend of mine is Bill Watson, he's an Engineer for Turbonetics)Now look these up on a Compressor Map(its on the left in the pic):



And its not too bad a fit, granted the T04b s2/s3 would be a MUCH better fit for these calculations, but they(Super 60) are not a bad turbo to go with, especially in a VNT setup.

Granted most of this is calculation, and Yes I know In the real world it might not work this way, but These are figures based on Physics and the flow charts distributed by Garrett. Yes I know there are guys out there running Super60's at 27 psi.. and there are guys with huge T04E Turbos on a 1.8liter honda.. But for the application(street use.. good spool up, and not a horrendous Drivablility...(honestly how many people with a turbo on an SVT engine will hit 6800RPM in 5th??)Ihave a firend running a super60 on a 2.3 liter volvo 4 cylinder, at 18psi and he loves it. Dodge relased the Super60 upgrade for their 2.2's in the Mopar Perfromance catalog, and hit 300FWHP out of it... So I wouldnt knock what others have done before...Granted I'm not knocking your experiences either... just showing a few other views on it..
Plus take into account that the SVT cam profiles have a tad bit much overlap for use on a Turbo charger without effectively wasting some of your boost... I can explain more on that later, or maybe Terry or Someone else can jump in here.. 8o)

Exactly.

Running small displacement 4-cylinders and making only 300HP. Plus at 18-20psi... Small turbos...

Smaller displacement can get away with smaller turbos...

I ran my Conquest of 6 different turbos (Super-60 one of them - the second smallest next to the stock TD05-12A weed wacker model)
Maybe pulled 240-250HP @ 20-22psi & 7.5CR from 2.6l (4-cylinder but close displacement) Very small compressor!

My N/A SVT pulls just over 20lb/min now... (have seen 22lb/min with a 65mm TB - even untuned) A turbo that flows that at 13-14psi isn't going to help it any... Well, down low it should help torque...

At the low boost level required by the high CR the turbo would be well below it's efficiency zone and hardly pushing any CFM.

High boost pressure (and the intake temp increase) & high compression are not friends...

Well,
Yes you are correct, but I took that Higher compression ratio into effect...If you look closely i used a .93 VE, when in actuality an SVT is closer to 90.25 or so... so yes I took High Compression into effect. Also... If you plot it with 8psi you will see that it does tend to drop off the efficiency on the right hand side.. The thing I ask you is this, when you ran the Super60, What boost did you run it at? I bet you arent gonna say 8psi... and on a 2.6liter Truck engine that was a dog in the N/A hp route, im not surprised it wasnt a champ... See the problem with running a HUGE T04E on like our engines is the spool up on them doesnt hit until say 3500-4000 RPM.. that kills you.. why would you need that? Beats me...Just firgured I'd try to contribute here...I know a tad bit about turbos(not alot mind you), ran a T-Type and aTurbo Volvo(to a 14.2 at 16.5 psi on a TD04H...LOL.. top that for tiny turbos!),and helped some friends with some other turbo cars... One-offed a Turbo design for a Ranger...