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(Post Link) post #1 of 20 Old 12-06-10 Thread Starter
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Help My horses have bolted

Hi people,

A few months ago I had a dyno run on my car (GT 2.0 JTS) which showed 126 bhp (). Since then I've had a new custom exhaust (MIJ) and a remap by Gus. This has brought it up to 146 which is a decent increase but still well short of what it should be. Adie at AHM can't figure it out without taking things apart which he reckons will be very expensive. MAF has been checked and all lambdas are reading fine. New air filter 4 months ago.

Anyone got any ideas? Car is 2004 with 68k miles.

Cheers,
Willber
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156

Optimistic on Alfa's part? My 2.0 should have 155 but read 145 at Red Dot.
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Optimistic on Alfa's part? My 2.0 should have 155 but read 145 at Red Dot.
I would be happy if I was only losing 10 bhp.
Mine's supposed to have 165. I know that this optimistic but 146 after remap and exhaust doesn't seem right.
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Have you tried yours back to back with a standard car? Might just be an under-reading dyno? That's assuming that the quoted numbers are calculated flywheel, rather than actual wheel HP?
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Have you tried yours back to back with a standard car? Might just be an under-reading dyno? That's assuming that the quoted numbers are calculated flywheel, rather than actual wheel HP?
Low figures were found on 2 separate rolling roads.
Does anyone know if Alfa's figures are for flywheel or wheels?
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Alfas figures will be for flywheel.
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Alfas figures will be for flywheel.
Ah, that's interesting. I'll check with Adie to see what his figures relate to.
Thanks for your replies chaps.
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https://www.alfaowner.com/Forum/alfa-...t-70-m4-3.html

Check the picture on the lower half of the thread, my car had done 70k and i found this accoring to Gus poor precat lambda connections can cause this...
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https://www.alfaowner.com/Forum/alfa-...t-70-m4-3.html

Check the picture on the lower half of the thread, my car had done 70k and i found this accoring to Gus poor precat lambda connections can cause this...
Are you talking about the coked-up valves biffa?
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I am the inlet valves were wedged...
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I am the inlet valves were wedged...
Right, could that explain the sluggish throttle response at low revs?
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Could do, but also poor preforming lambda (more so precat) and MAF's, Gus is the best one to chat with he helped me alot with this... My car was running less than 120hp before the rebuild now easy 140 plus, i do have a lambda/MAF issue at the moment but i think it the MAF it over due a change...
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Thanks biffa, I'll have a chat with Adie, he has contacts with Gus who is a bit too far away from me!
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(Post Link) post #14 of 20 Old 07-07-10 Thread Starter
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Right, I'm going to give this a go: Ecotek PowerBoost

Engine is pinking under load so I think carbon build-up may be my problem.

There have been a couple of reviews on here which have been positive. I'll report back when I've done it (haven't got the stuff yet).

If you think I'm making a big mistake please let me know!
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Right, I'm going to give this a go: Ecotek PowerBoost

Engine is pinking under load so I think carbon build-up may be my problem.

There have been a couple of reviews on here which have been positive. I'll report back when I've done it (haven't got the stuff yet).

If you think I'm making a big mistake please let me know!
I've used that on a 2.4 JTD before, with good results. It certainly cleared quite a bit of muck out of my inlet manifold, I got nearly half a Coke tin of crap out with just a rag and a screwdriver, and then used the powerboost afterwards to hopefully dissolve anything remaining. For the first half-mile the car was kicking out tonnes of smoke, and then it all cleared. It drove much better afterwards, so I assume it worked.
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I've used that on a 2.4 JTD before, with good results. It certainly cleared quite a bit of muck out of my inlet manifold, I got nearly half a Coke tin of crap out with just a rag and a screwdriver, and then used the powerboost afterwards to hopefully dissolve anything remaining. For the first half-mile the car was kicking out tonnes of smoke, and then it all cleared. It drove much better afterwards, so I assume it worked.
Hi Dan,

Are you saying that you did a "de-coke" before the treatment? How much would that cost?
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Hi Dan,

Are you saying that you did a "de-coke" before the treatment? How much would that cost?
I literally took the inlet pipe off the throttle body, wrapped a rag around the end of a long screw driver and kept poking and scraping, pulling more and more crap out each time, until it half-filled an empty Coke can (ironic 'eh? ) Spent a couple of hours on it, but the JTD's inlet maniflold is very square and makes doing this sort of thing quite easy. It helped that mine was a CF2 with no throttle flap as well.

The coking on a JTS is there for a different reason though, and is mostly on the back of the valves rather than in the inlet manifold. On the JTS its there due to combustion, on the JTD its there because the oil mist from the turbo and the soot from the EGR mixing. The back of the valves aren't accessible with the inlet manifold in place, so doing what I did to my car on your car is out of the question.. I would give the Powerboost a shot, and see how you go. It should be more effective on the JTS than it was on my diesel, cause on the diesel its a sticky, oily, tar-like substance, on the petrols it should be pretty much solid carbon.

Autolusso Penrith - UK's leading independent Alfa Romeo specialist with branches in Bedfordshire, Cumbria & Dorset

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I literally took the inlet pipe off the throttle body, wrapped a rag around the end of a long screw driver and kept poking and scraping
Hear that everyone, rag-on-a-stick, the Autolusso way!



Anyway, I'll give the Powerboost a shot, sounds like it won't do any harm.
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Hear that everyone, rag-on-a-stick, the Autolusso way!



Anyway, I'll give the Powerboost a shot, sounds like it won't do any harm.
Sometimes the simple solutions are the best, it certainly sorted my JTDs sluggish performance out, but it was in my pre-Autolusso days, when I only had a little one-car garage with pit, and a rusty chest full of imperial tools

If I had to do the same job again, I'd just take the manifold off and stick it in the hot wash, which would get out every last bit of crap. I'm sure the rag-on-a-stick method didn't get it all out, but it did pull a fair bit out and certainly made a noticeable difference.
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Sometimes the simple solutions are the best, it certainly sorted my JTDs sluggish performance out, but it was in my pre-Autolusso days, when I only had a little one-car garage with pit, and a rusty chest full of imperial tools

If I had to do the same job again, I'd just take the manifold off and stick it in the hot wash, which would get out every last bit of crap. I'm sure the rag-on-a-stick method didn't get it all out, but it did pull a fair bit out and certainly made a noticeable difference.
Just a shame I can't do that with my JTS.

If the spray doesn't work how much would it be for a head-off clean?
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