However, it was missing 25 BHP. Literally.
On the rollers it only managed 126bhp with no visible signs of anything wrong.
Then they remapped it and it made just 160. 25 less than normal.
The EGR was mapped out, but I'm going to fit blanking plate anyway.
But that wouldn't gain me 25 gee gees.
Any ideas? They thought it could possibly be the exhaust restricting things, possibly the cats.
Did Reddot say anything about the turbo?
Im not suggesting it has a problem :| (2 .5 yrs ago) My old GT JTD had 152.9 on first dyno and increased to 183.9 after they remapped it. Just a (curious and unsubstantiated) thought :surprise::|
I've always wondered how much top end power all the crud that builds up in the inlet manifold and ports costs. If it was that, it should show up in the maf values, did they log them?
When I had the inlet manifold changed and swirls deleted on my 2.4 spider, I immediately felt more responsiveness, lot more eager and no smoke.
Get that manifold cleaned.....
May not return 25bhp though
We ran several 1.9 GT's yesterday and the calculations are identical for each. We are genuinely confused with Mark's car. It needs further investigation. It definitely feels like it is holding back.
We applied the remap to check if the EGR valve was causing the issue. We have advised mark to get it looked at. The remap will not cause any issues with identifying the underlying problem.
As others say it'll be a restriction in air flow rather than anything else.
You've had quite a bit of work done to the car in terms of maintenance.
Maybe some new gear oil wouldn't go a miss. But yes 25 horses is quite a bit to loose. Making the poor GT a bit better than the average. I mean 160hp in a diesel really isn't that much.
Wow!! Thats filthy my pollen filters looked a bit like that haha, all clean now.
How did you get the filter out? I tried undoing the clips at the bottom but can only open the box about 3 inches or so, could of ripped the old one out but would not be able to get the new one in very well then.
PS. That would certainly be sappiung a bit of power for sure, not sure about 25bhp though?
It's good practice to change the air filter when changing the maf from what I'd read when I had trouble with mine caused by a leaky airbox.
With your filter being that bad there may have been a chance your new MAF may have become dirty/damaged. Just a though in case you put it back on rollers and find your still a few pony's short.
I think if your bothering remapping and rolling roading, putting afresh air filter in every year or 5,000 mile is worth while.
I use a k+n washable so probably just about braking even/into profit in cost after 7 years.
if I was to do over id just keep sticking in oe filters.
while im under there doing the oil, its only a bit longer to do the air filter(on the stilo)(but longer with a wash ,oil and dry).and I usually give the maf a blast (maf cleaner)also, as taking it off makes the air filter job easier
same with map sensor ,no reason not to clean annually.
I bet your mpg goes up a bit with fresh filter in.
Im sure manufacturers are stating 30,000 mile plus changes but is it worth it to leave them that long ?
same with fuel filters, im think mine is supposed to be 60,000km ?
no thanks I change every 2 years min prob 10,000miles.
I think this sort of service plus oil and filter is what id recommend before any sort of remap or rolling road work.
There has been a bit of an improvement but not had a good enough run out yet to tell for sure.
De-Cat gets delivered this afternoon, so that'll liberate a few more gee gees! :smoker:
Three weeks ago I noted that my car was 'holding back', significantly so in the morning.
I decided to check the egr. I took it off and it wasn't bad actually as its only a year old, however I had a look at the inlet manifold port which the egr valve connects to and it was chocked full of solid soot! As in there was barely and airflow space. I hacked a way with it at a screw driver for about 15 minutes. I then put the egr back on, took it for a drive and the difference was huge.
If I had to put a figure on it I'd say 5-10bhp. Its like filling up with ASDA fuel for a week, then filling with Vpower times by 3.
My EGR was 'mapped' out, even so, I've bought some blanking plates, they get delivered with my de-cat.
Hopefully when I get the GT back on the rolling road it'll be like a new car!
Thats the middle cat. Is the front one still fitted? (it bolts directly to the turbocharger)
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