Need a good V8 tuning / diagnostic shop near Southampton
Discussion
Hi all, got a 4.0ltr Chim that has never run as smooth as I wanted. Low revs it jerks and shunts especially just trickling along at 30mph, now have to drive in 3rd in traffic.
Tried everything simple, throttle pot, new leads, etc. - Cant be much wrong with it coz it goes like hell when you floor the throttle,but there is a flat spot on acceleration at 2500rpm if you dont floor it.
Servicing by TVR dealer didnt show up anything wrong, so I guess its down to a tuning shop and rolling road.
Anyone recommend anywhere on south coast near Southampton?
All the specialist shops seem to be in the midlands or Norfolk!
Tried everything simple, throttle pot, new leads, etc. - Cant be much wrong with it coz it goes like hell when you floor the throttle,but there is a flat spot on acceleration at 2500rpm if you dont floor it.
Servicing by TVR dealer didnt show up anything wrong, so I guess its down to a tuning shop and rolling road.
Anyone recommend anywhere on south coast near Southampton?
All the specialist shops seem to be in the midlands or Norfolk!
There is a good rolling road at Hurn Airport, Triton Motorsport, run by Andy Vey, they specialise in suburas and evos but will look at TVR's, Andy used to own a Cerbera.
Took mine there a couple of weeks ago, found that it was running very rich at 4k rpm and dumping fuel, Andy was helpful and gave me afew suggestions as to what it could be, i didn't get them to tune it but i am sure they would.
Contact details are www.tritonmotorsport.com
Good luck, Lee
Took mine there a couple of weeks ago, found that it was running very rich at 4k rpm and dumping fuel, Andy was helpful and gave me afew suggestions as to what it could be, i didn't get them to tune it but i am sure they would.
Contact details are www.tritonmotorsport.com
Good luck, Lee
Id be really interested in having a look at it, Ive been looking at the fueling on this engine / ECU pretty closely recently, and have made up a test box that you can view the fueling whilst its being driven. Im up near Newbury if you fancy a run. I also have a couple of different fuel maps available.
Mark
Mark
blitzracing said:
Id be really interested in having a look at it, Ive been looking at the fueling on this engine / ECU pretty closely recently, and have made up a test box that you can view the fueling whilst its being driven. Im up near Newbury if you fancy a run. I also have a couple of different fuel maps available.
Mark
Bloody hell, offers dont come much better than thatMark
If you want to contact me drop me an email with a phone number via pistonheads, or direct at blitzracing@zoom.co.uk. As for a "control" Ive now spent many hours looking at my own fueling, and know what it should look like as the car runs perfectly, so one with a problem is really of most interest at this stage. I cant guarantee to pick up the fault looking at the lambda probe outputs , as the ECU constantly tweeks the mixture, but I think some of the issues could be the amount of correction taking place, that I should be able to see. I can also try running the non catalyst map (briefly) to see if the fault changes. It would be good to have a variable fuel pressure regulator fitted, to give some fueling leeway. Your DIY options are very limited otherwise, if another another plug in map does not help.
Mark
Mark
I had a lot of problems with low speed shunting on my 4L and had a flat spot at 2750rpm. The TVR Power smoothing chip definately helped, as did having the airflow meter set to the right voltage, the added HP and torque was an added bonus it hit 224bhp and 245ft lb on Joo's rolling road at 4750 rpm
It didn't completely cure the problem so I put my name down as a guinea pig for the prototype Torque RVT induction kit which replaces the existing airflow meter and plenium flap and increases the airflow into the plenium by heaps.
Result: once set up, smooth as a babies bum, no shunting, revs much better and got 236bhp at a higher peak of 5250rpm, which is pretty good for a 4L.
I should say that the Eann the fitter reconed that my airflow meter was less than perfect but apparantly that's nothing unusual.
It didn't completely cure the problem so I put my name down as a guinea pig for the prototype Torque RVT induction kit which replaces the existing airflow meter and plenium flap and increases the airflow into the plenium by heaps.
Result: once set up, smooth as a babies bum, no shunting, revs much better and got 236bhp at a higher peak of 5250rpm, which is pretty good for a 4L.
I should say that the Eann the fitter reconed that my airflow meter was less than perfect but apparantly that's nothing unusual.
Edited by Ab Shocks on Thursday 15th November 09:11
Bill_H said:
I'm starting to drool.
Can you give me an idea of the price of the induction kit upgrade?
Funny isn't it, just spoke to Eann and he is fitting two kits in Southampton on 29/11/07 on TVR cars.Can you give me an idea of the price of the induction kit upgrade?
Supply,fit and setup on the laptop is £690.
PM me for Eann's number if you want to have a natter with him.
blitzracing said:
Sorry, I thought yours was perfect, and 3k is about where the fuel map goes open loop. Let me see what Bill H says, but I dont mind having a look over a weekend soon.
Mark
Mark
Give me a shout either way - it's not far and it's always a pleasure to start her up. My weekends are fairly free during the days at the moment.
Had a long close look at the fuelling on the 4 litre today to try and eliminate the snatching you can get around 1500 rpm in higher gears. Having set up monitoring on both banks, it immediately became clear the Lambda probe outputs where showing very lean, and with a touch more throttle the mixture corrected, and the snatching cleared. So simple, get more fuel in. We put a 1k ohm variable resistor inline with the temperature sender, and increased the resistance to make the ECU think the engine was cold and put in more fuel. This setup worked perfectly on idle, to the point you could get it so rich, the ECU could no longer compensate to keep it at Lambda 1. This however made no difference to the snatching at all, and it still showed lean ???. OK, tried 2 different fuel maps, a 3.9 TVR and an Adams 4.2. Again hardly any difference, although the Adams chip was fractionally better. Last attempt, switch it to the non cat map, and wind up the CO setting to put more fuel in. No lambda feedback to get in the way now. Same result???? I can only assume that due to the cam fitted that some unburnt mixture is being dumped through to the exhaust at these low RPM due to lack of inlet velocity, and causing the lambda probes to read the unused oxygen as a lean mixture. This would explain why some inlet modifications help reduce this, as it improves the cylinder fill and burn. I don’t get the problem on my engine, but I have cast exhaust manifolds and a slight softer cam (Piper 270.) Comment welcome !!
Mark
Mark
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