- Nov 2, 2005
- Great Britain
- audi a4 2.5 tdi 98 quatrro 6speed
I have no problem with spool Diffas, it's clutch slip i am experiencing in 4th,5th and 6th gear if i get over 3000rpm's, also i suffer from fuel starvation- drilled the banjo bolt supply lines a little larger so we'l see if it makes any difference. FJTwelve mentioned that they have replaced the lift pump in the tank- however i wonder if they have fitted the right one ! I am thinking on using a bmw 530 in-line pump or passat 1.9Tdi quattro in tank lift pump if it's able to flow more fuel than i get at the moment, when i step on it the pump has a funny "bark" when it's trying to adjust/fuel the hungry nozzles ! So far the engine holds toghether rather well, the smoke is minimal and the power is there- reverted back to Celtic Tuning map as it's easier on the clutch !adamss, it's not wise to put bigger turbine wheel (45mm/50mm) than you find from gt2260v.
Imho best hybrid comes when using 5-blade compressor and turbine from bmw gt2260v. Spools from 1700 and goes over the redline.
I had biggest turbine (51.5/47) available inside stock housings, from gt25v. It was bit laggy with that, with the same compressor wheel. Housing is probably too small for that wheel. Emp decreased about 0.8bar compared to the smaller gt22 turbine on upper revs.
Thanks, will look for something that will deliver enough fuel to keep the injectors happy ! So far i have reverted to old Celtic Tuning map as it's easy to live with it + it's not too smokey under 2000 rpm's ! I need to take it to a rolling road soon to see what power the engine has at the moment !If you're installing external lift pump remember to add big enuff. Something like 300+l/h @ 1bar should be good.
For the quality you can ask http://forums.tdiclub.com/member.php?u=20752 .He has one set.I don't know if he has putted them.Yep, still running these, i am thinking to get some nozzles from Doktorek but i am afraid they might be of dubious quality...Some recommended Firad tips and i know you're running cummins nozzles. The turbo above is meant to go on my allroad v6 tdi, it's been in the bodyshop for the last 6-7 months for a full respray/colour codding... That has Bosio pp683 nozzles fitted to AFB injectors and i just had a map done for them- will report back when i get it back in a day or 2...not a hint of smoke on them and nice progressive power although has less torque low down- still on original tune !
The allroad is my tow horse so i need it reliable, i bought another one (newer- 2004 model) whilst this was in the bodyshop as i buy cars as spares or repairs ! The newer one is thirsty-its auto BAU 180Bhp- and not as powerful.
Don't be offended mate, it's just that i am old enough to know that branded products are most of the time better than un-branded products. Injector nozzles are delicate and i would not get a gamble with cheaper nozzles unless i know they've been tried and tested before.For the quality you can ask http://forums.tdiclub.com/member.php?u=20752 .He has one set.I don't know if he has putted them.
@doktorec: Do you have some close up images to see the pattern of the hole positions? Also I would like to know how much they flow (cc/min).For the quality you can ask http://forums.tdiclub.com/member.php?u=20752 .He has one set.I don't know if he has putted them.
I'm working on boring a 2.5 to 2.7 using 4.0 liter pistons. Initial problem is the head gasket as the bore is slightly smaller than the 4.0 piston diameter.Has anyone bored V6 TDI to oversize?
Stock 78.3 by 86.4mm. Is there a compatible longer stroke crank available and do V6s use normal VAG 88mm bore spacing or something else?
And even further would bigger bore allow modifying cylinder heads and for example use bigger valves?
Pump is **** before you get bigger nozzles.Then it's perfect because she can provide 1820bar.Engine ain't **** with roller heads (same structure as in 3.0tdi) - pump is ****.
81mm bore is absolute max. Wall is getting too thin. You can use cr 2.0tdi pistons for that...
LongJohn, you're always asking year after year...you never do anything.
3.0/2.7 have their own set of issue. Cam chains are craptastic and the later engines have 100 pounds over the 2.5 and are a lot larger in size.Better get a 3 liter and an immo delete, you wont regret