Mythbuster: continuing project thread of my 1303 '75

[volkdent]

Nice find, I see lots of power in your future!!! How do you think this one will stack up against your current one for lag?

Jason

[kuleinc]

Its a 2.2L it should be pretty wicked, I'm guessing 3K to 3500 for spool start time... I think a GT30R has ball bearings...

[Wally]

Originally Posted by volkdent

How do you think this one will stack up against your current one for lag?

Jason

Ah, yes, good question, which I wonder myself also. Actually, I would ideally have wanted the GT3071R for even a little lesser lag, but this one came along..

Kulein: the former IHI VF34 had ball bearings also! Theoretically spool should be (much) later, but in reality I think it will not make that much of a difference. A little later spool is not neccessarily a bad thing! I actually like spool to be a little later so your not on (back)pressure all the time on the highway and overall back pressure (=high EGT) is less.

About 1 bar boost (14.5 psi) at 3800-ish rpm would be excellent for me. Right now I had 1 bar at 3300/3400 rpm in 4th. The old turbo had a nicer (for me personally that is) spool on the 2 liter.
Purely track driving, spool of the VF34 was better on the 2,2 I think. In 3rd coming out of a corner at 3000-3200 rpm, spool came in really nicely an drelatively gentle. That last thing is cam and tune (wastegate ecu control) dependant as well of course.

[effvee]

Hi Walter, please be very careful of the waste gate location. If somethng hit it/bend it, you could over boost.

[kuleinc]

I think a lot of people use the GT30Rs here for 2.0 - 2.2L engines, with good results, but these aren't Aircooled VW engines, so who knows...

[evilC]

Originally Posted by effvee

Hi Walter, please be very careful of the waste gate location. If somethng hit it/bend it, you could over boost.

Heat on the outer CV could also be a problem especially when stationary after a power run and its glowing red hot. You could kill two birds with a heat/impact shield over the waste gate and exhaust side of the turbo.

Clive

[Sandeep]

Great looking (re) install . I would not worry about the closeness of the turbine to the outer CV as I have my turbo installed in the same location with no issues.

My exhaust pipe was actually 19mm away from the inner sidewall of the rear passenger tire and no problems after some hard runs and then sitting. The cooling airflow in that location is a bonus

Looking forward to the upcoming performance reports

Sandeep