6 replies to this topic

[Nossedout]

Hi :)

 

I have started a new tread in Mini Saloons- be sure to check it out! Turbo Suzie :3.

 

Anyway,

 

I have installed a suck through turbo on a 998 Engine. Carb is a Stromberg 1inch. The mini starts and drives however, I am not achieving enough boost. On idle, both gauges are showing approx -0.7bar suction. once I start driving (approx 1.3k rpm) boost gauge comes to almost 0, over 3k rpm boost will only be approx 0.1- 0.2 bar boost. While driving, you can feel the turbo giving the extra kick & you can hear the turbo spooling etc. 

 

At first I have suspected that the boost gauge is faulty however I have installed 2 - One on the compressor side i.e. bypassing the waste gate & other on the manifold side as per photos. 

 

Any hints why it is not boosting enough? Turbo is of a Transit 2.4 TDCI. approx T2.5. Wastegate is normally closed and confirmed it is closed.

 

Carb too small?

 

 

Attached Files

•  10.jpg   53.74K   0 downloads
•  11.jpg   61.87K   1 downloads
•  20210120_223636.jpg   91.09K   4 downloads

[dyshipfakta]

Boost leak somewhere I would imagine manifold. A 998 will take some revs to get that turbo moving also. Maybe try something smaller like a gt15?

[Steve220]

How much preload is on your actuator?

[Tommyboy12]

I assume that that vacuum line in the inlet manifold is blocked off? Otherwise I would be looking at your turbo. Trim, AR and impellor size is probably way out for this application. Your turbo is designed to run with an engine 2.5 times larger than this one.

[Turbo Phil]

I’d be looking at the carb. If it’s 1” as you posted it’s going to be choking airflow off massively. No air, no boost.

Phil.

[Dusky]

Both a big turbo and a tiny carb.

[Nossedout]

will be changing the carb to a bigger one and see if there is any difference. I suspect that the carb, as mentioned above, is small