Having cam changed - should I get injectors cleaned

[thegman]

Anybody had injectors cleaned as part of a cam change? How much did it cost and do you think it is worth the money?

[spend]

Not with the US exchange rate IMHO £250ish new vs cleaning / inconvenience / resale cost

Dave

[rev-erend]

Changing the injectors is a good idea if they are known to be running bad but buying new injectors could mean the new ones have a different flow rate to the existing injectors .. and may need a remap.

So - I would clean them unless you plan on further engine mods and have a remap in mind anyway.

[Hoover.]

I changed mine.....

[thegman]

Hoover. said:

I changed mine.....

Where did you source from and did you need a remap? Am trying to keep costs down.

[That Daddy]

This guy maybe just what your after http://cgi.ebay.co.uk/ULTRASONIC-FUEL-INJECTOR-CLE... some jammie bugger just bagged 8 RV8 lucas injectors fully cleaned and serviced for £40 from the same guy(i would have liked em)anyway for injector servicing this is cheapand if your car is getting on then this is a good idea.

Edited by That Daddy on Monday 7th April 19:27

[blitzracing]

Personally I don’t think remapping is all its cracked up to be as a required fix for everything. Firstly in closed loop (That’s below about 3/4 throttle or around 3200 rpm) The ecu will simply tweek the mixture all the to keep it at the correct fuel air ratio, and as long as the basic fuel map is not too far out, the ECU will cope with the adjustments. When the ECU goes open loop, it does just rely on how good the original map was, but you can increase or decrease the overall open loop fuelling with a simple fuel pressure regulator for £25 upwards. A good remap can do things like improve the drivability if the ecu is battling to keep the fuelling in line, (ie the original map is poor), improve fuel consumption, reduce cold start overfuelling, and various other nice little tweaks, but its very expensive due to the lack of people with the specialist Lucas hardware required. There is however no shortage of fuel maps around for these engines, TVR power has a box full of them they can try on the rollers. Mark Adams is the only one I know who has the Lucas hardware to modify your existing map.

Mark

[chrispitman]

That guy on ebay only cleans the injectors I thought the O rings and new filter are normally fitted hence why he is cheaper.

[That Daddy]

chrispitman said:

That guy on ebay only cleans the injectors I thought the O rings and new filter are normally fitted hence why he is cheaper.

Ahhi should have read the auction properly

[Pupp]

blitzracing said:

Personally I don’t think remapping is all its cracked up to be as a required fix for everything. Firstly in closed loop (That’s below about 3/4 throttle or around 3200 rpm) The ecu will simply tweek the mixture all the to keep it at the correct fuel air ratio, and as long as the basic fuel map is not too far out, the ECU will cope with the adjustments. When the ECU goes open loop, it does just rely on how good the original map was, but you can increase or decrease the overall open loop fuelling with a simple fuel pressure regulator for £25 upwards. A good remap can do things like improve the drivability if the ecu is battling to keep the fuelling in line, (ie the original map is poor), improve fuel consumption, reduce cold start overfuelling, and various other nice little tweaks, but its very expensive due to the lack of people with the specialist Lucas hardware required. There is however no shortage of fuel maps around for these engines, TVR power has a box full of them they can try on the rollers. Mark Adams is the only one I know who has the Lucas hardware to modify your existing map.

Mark

Mark, this has just reminded me I've been meaning to ask how certain is it that the stock ECU goes open loop on those conditions being met? Reason I say is before I stripped out the stock ECU, I kept tabs on it for a while using a wideband display. The typical cycling around 14.6:1 - 14.8:1 just seemed to me to be equally evident no matter how hard I was driving it... at least until it was too quick to be watching AFR! In the run up to pulling the thing I was actually becoming more impressed with its stability and flexibility. Has an Adams chip in it if that makes any difference...

[spend]

Main advantage of AFM's ?

[Pupp]

spend said:

Main advantage of AFM's ?

More pretty lights than a spaceship. Silly Q

[blitzracing]

Pupp said:

blitzracing said:

Personally I don’t think remapping is all its cracked up to be as a required fix for everything. Firstly in closed loop (That’s below about 3/4 throttle or around 3200 rpm) The ecu will simply tweek the mixture all the to keep it at the correct fuel air ratio, and as long as the basic fuel map is not too far out, the ECU will cope with the adjustments. When the ECU goes open loop, it does just rely on how good the original map was, but you can increase or decrease the overall open loop fuelling with a simple fuel pressure regulator for £25 upwards. A good remap can do things like improve the drivability if the ecu is battling to keep the fuelling in line, (ie the original map is poor), improve fuel consumption, reduce cold start overfuelling, and various other nice little tweaks, but its very expensive due to the lack of people with the specialist Lucas hardware required. There is however no shortage of fuel maps around for these engines, TVR power has a box full of them they can try on the rollers. Mark Adams is the only one I know who has the Lucas hardware to modify your existing map.

Mark

Mark, this has just reminded me I've been meaning to ask how certain is it that the stock ECU goes open loop on those conditions being met? Reason I say is before I stripped out the stock ECU, I kept tabs on it for a while using a wideband display. The typical cycling around 14.6:1 - 14.8:1 just seemed to me to be equally evident no matter how hard I was driving it... at least until it was too quick to be watching AFR! In the run up to pulling the thing I was actually becoming more impressed with its stability and flexibility. Has an Adams chip in it if that makes any difference...

The exact settings on when it goes open loop are programable, and I know its one of the things Mark can alter. Ive only done monitoring with the stock Lambda probes, but its quite obvious the ECU going open loop, the lambda output goes to over .7 volts and stays there. Even if you just hold the throttle open for a few moments,(beyond the point of normal fuel enrichment) its quite obvious. Ive observed this on the stock Range Rover fuel map, TVR Chimaera map, and a JE Engineering map. Ive tried an Adams map for a 4.2 on my 3.9, but it ran very lean under high load, and so I stopped testing. The guy's 4.2 I borrowed it from had no such problems, so it simply did not suit my setup.
Mark

[im]

blitzracing said:

Mark Adams is the only one I know who has the Lucas hardware to modify your existing map.

Its getting hold of him thats the problem...

[Hoover.]

thegman said:

Hoover. said:

I changed mine.....

Where did you source from and did you need a remap? Am trying to keep costs down.

got mine from Rob Robertson about 2 yrs ago circa £300 ...... as they were slightly bigger I did have a slight overfueling issue but that was only pops bangs and occasionally flame ..... I had a rolling road set-up/remap eventually as I needed to have the rolling road to calibrate new speedo/gear box