[GriZZly]

Hi,

Ive been tossing up to go with the gtk1000 or a gt4202 on this engine.. Looking at the T76 comp maps (which i know arent whats in the 1000 but im guessing its close) and gt42 maps theyre pretty close and the turbo stays in peak efficiency at peak power..

I was hoping someone could give me an idea when the gtk would start spooling and at what rpm id see full boost..

Also Robert, is there an updated ETA on the arrival of the comp maps for the GTK's?

Thanks

[TurboKits.com]

What exactly have you done to the engine? head work? compression? Engine management? Fuel being used?

Jesse

Originally Posted by GriZZly

Hi,

Ive been tossing up to go with the gtk1000 or a gt4202 on this engine.. Looking at the T76 comp maps (which i know arent whats in the 1000 but im guessing its close) and gt42 maps theyre pretty close and the turbo stays in peak efficiency at peak power..

I was hoping someone could give me an idea when the gtk would start spooling and at what rpm id see full boost..

Also Robert, is there an updated ETA on the arrival of the comp maps for the GTK's?

Thanks

[GriZZly]

Stock engine, 10:1 compression, aftermarket ecu (adaptronic), and im from australia so fuel is 98 octane pump fuel, not sure what that equates to in the US.. 92 maybe?

planning to run upto 18psi of boost

i know thats a high compression for a turbo engine but ive seen a number of motors making over 400rwkw (~550rwhp) on stock motors with the same comp ratio, with smaller turbos..

[TurboKits.com]

I would say you should see your target boost levels somewhere in the mid to high 3000 RPM level. If after you install the GTK 1000 (which we have in stock) you are not happy with the spool, you can swap in a GTK 850 turbine housing and that will lower the spool greatly, but will also limit your top end power.

Let me know, we ship international all of the time, have partnered with shipping companies for great international rates and have a lot of experience doing it.

Thanks

Jesse

Originally Posted by GriZZly

Stock engine, 10:1 compression, aftermarket ecu (adaptronic), and im from australia so fuel is 98 octane pump fuel, not sure what that equates to in the US.. 92 maybe?

planning to run upto 18psi of boost

i know thats a high compression for a turbo engine but ive seen a number of motors making over 400rwkw (~550rwhp) on stock motors with the same comp ratio, with smaller turbos..

[Robert]

Originally Posted by TurboKits.com

I would say you should see your target boost levels somewhere in the mid to high 3000 RPM level. If after you install the GTK 1000 (which we have in stock) you are not happy with the spool, you can swap in a GTK 850 turbine housing and that will lower the spool greatly, but will also limit your top end power.

Let me know, we ship international all of the time, have partnered with shipping companies for great international rates and have a lot of experience doing it.

Thanks

Jesse

Jesse is spot on with his assessment and my apologies for not catching this thread sooner. With everything I have going on I tend to miss some.

[GriZZly]

Thanks for responses, couple more questions..

When would the 1000 start to spool? the stock engine makes peak power around 5500rpm so even with the close ratio 6 speed box im going for itll be hard to stay on full boost around a circuit

Could i expect 18psi from the 850 before 3000rpm? and if i was to do the cams in the engine to allow it to breath higher, when would the 850 start to drop off and make the 1000 that much more worthwhile?

[TurboKits.com]

There are a lot of variables that can change the answers, but I would expect you to start seeing boost in the mid to high 2000 RPM range. The GTK 850 should give you full boost 600 - 1000 RPMs sooner with the smaller AR. However the smaller set up of the GTK 850 will require a higher boost level to make the same power.

If it was my car, I would do the following...
Get the GTK-1000, install and test. If I wasn't happy with spool I would try a set of more aggressive cams. If the cams still didn't give me the response I wanted I would swap for a GTK 850 Turbine Housing.

This would allow you to run the larger trim of the GTK 1000 and still get the smaller AR and faster spool of the GTK 850 and the housing is only a few hundred which would save you from having to buy a whole new turbo and would drop right into place of the GTK 1000 Turbine Housing.

I suggest the above process because of your 18PSI boost limit. If you go with the GTK 850 and aren't happy with it, you're stuck buying a new turbo, whereas if you start with the GTK 1000 your options stay open.

Hope this helps. Let me know if you have any further questions.

Originally Posted by GriZZly

Thanks for responses, couple more questions..

When would the 1000 start to spool? the stock engine makes peak power around 5500rpm so even with the close ratio 6 speed box im going for itll be hard to stay on full boost around a circuit

Could i expect 18psi from the 850 before 3000rpm? and if i was to do the cams in the engine to allow it to breath higher, when would the 850 start to drop off and make the 1000 that much more worthwhile?