106Gti down on power

[StottyZr]

Last week I bought another 106Gti. I've noticed it is a little slow, I was told vaguely it had a manifold and some kind of exhaust modification and is possibly performance camshafts (it runs a little lumpy)

I've had a look today and I believe the manifold is a Janspeed 4-2-1 (correct me if I'm wrong, I've only compared it to pictures)

I also found this



Because the car is stupidly low (soon to be back on standard springs) its using the exhaust to chip away at speed bumps

I'd expect with the mods this car should be pulling 130hp, it feels more like 110hp and the lack of power is even more noticeable below 4k rpm.

Possibly a stupid question but before I go buying another manifold would this explain the drop in power?

[mk2 24v]

Those dinks in the 2 primaries shouldn't have made that much a dent to the performance. The GTI used to like killing the cats for fun when I worked at a main dealer though, and usually on returning from road test too
Used to feel like someone had chucked an anchor out on some of them when the cats blocked as well

[Kitchski]

Only way you'll know is to bung it on a dyno. You won't get absolute figures, but you'll get a range. A good one of these should be dishing out around 105WHP.

I'd offer to do it for you, but other end of the country and all that

[StottyZr]

Cat is a good shout, I'm also thinking the timing could be out?

A dyno would be nice but to ensure the lack of power wasn't in my head I previously benchmarked my old GTi against a friends car, we did the same test and it proved that this car is much slower than the previous GTi.

[Rupert Rigsby]

Injector have been known to give problems on these, so might be worth checking that all is well with them.

[StottyZr]

Rupert Rigsby said:

Injector have been known to give problems on these, so might be worth checking that all is well with them.

Is there an easy way to do this? At a guess I'd say disconnect them, crank the engine over and visually check for consistency?

Apologies for the basic questions.

A blocked cat can be ruled out now as the car doesn't have one

[Krikkit]

If it's a bit dodgy below 4K I'd suggest looking at the Lambda.

To be honest it could be a few things! Looking at the pics it's a 2-prong head, so should be the best of the lot.