Thread: Turbo'd KW

Originally Posted by land864

Factory data states the following about the 3.9 Isuzu

N/A 66kw @ 3200RPM and 245Nm @ 1900RPM

T 90kw @3000rpm and 314nm @ 2200 RPM

I'm guessing they are factory figures for a factory turbo

Any one have any real world figures after fitting their own Turbo and proven on a Dyno?

had mine on a chassis dyno but the wheel figures are very different to crank

From memory a couple of before and after turbo dyno sheets have been posted in this forum - Andrewe for one.

Thanks John

I'll do a search

Please post a link to your findings, I'm also interested.

Instead of searching for the posts here are the pics that I saved.

Thanks John

Now I just have to work out how to read em

Originally Posted by Bush65

Instead of searching for the posts here are the pics that I saved.

Is that a bog standard turbo??
There seems a massive increase - I read it as @ 102 KPH you have gone from 43 hp to 78 hp & 245 ft/lb to 470 ft/lb ? at 10 PSI

Originally Posted by DeeJay

Originally Posted by Bush65

Instead of searching for the posts here are the pics that I saved.

Is that a bog standard turbo??
There seems a massive increase - I read it as @ 102 KPH you have gone from 43 hp to 78 hp & 245 ft/lb to 470 ft/lb ? at 10 PSI

Sorry I don't know - those dyno charts are not mine.

I can't recall who posted the first two dyno charts or the turbo that was fitted. The last dyno chart was posted by andrew e - IIRC he did not use a stock Isuzu 4BD1T turbo.

I had hoped whoever posted them would see this thread and comment. The alternative if you need more info is to search through old threads here - I'm not about to do that.

Fitting a turbo to a n/a 4BD1 may not give any power increase unless there was some surplus fuel that was not being burnt due to lack of air before the turbo.

To get an appreciable power increase when a turbo is fitted, it is necessary to turn the full load screw out - how much fuel and power can be increased then depends on how much air the turbo can provide.

So even if the same turbo was fitted to 2 different 4BD1 engines, there can be large differences in power due to how the fuel injection pump was adjusted.

BTW, I will post up figures when my truck goes on a dyno sometime early (I hope) in the new year. My Borg Warner turbo is larger than others here and from the info I have, it should deliver enough air to burn all of the fuel the stock injection pump can provide when max'ed out (170 to 180 cc/1000 strokes).

Edit: IMHO, the power increases shown on those dyno charts is mediocre compared to what the engine is capable of in our vehicles. Massive is not a word I would use to describe it.