Det on high revs - Page 2

dellaruse · 10-11-2006, 04:34 PM

Quote:

Originally Posted by T.F.S.

knock normally increases the further up the rev range you go, a rise with RPM is not a problem as it is normally engine noise not knock

what we really need to take notice of is a sharp increase in knock that seems to come out of the blue, then you know its detonation

thinking about it det in 5th could also be caused by the fuel rail depressureising, one of my customers done this with his nitrous kit.....fuelling was fine but in 5th over a long distance the pressure dropped and fuelling was not sufficient

please note: i know nothing about cars or engines so ignore everything i have said

Will fitting fuel pressure reg solve it?

**Bill Oddie** · 10-11-2006, 04:39 PM

Quote:

Originally Posted by dellaruse

Will fitting fuel pressure reg solve it?

im not saying it is the fuel, just that it might be

to check this you need wideband or at least a fuel pressure guage (see rebuild thread under "seting up and performance")

a fuel pressure regulator would not solve this if this was the case, you would need a better pump or the same pump with correct live (sometimes the pump only sees 10 volts rather than 12 due to age)

the regulator can increase pressure but only because it RESTRICTS flow, more pressure....less fuel from the pump

please note: i know nothing about engines or cars, ignore my comments

Richf · 10-11-2006, 04:51 PM

Quote:

Originally Posted by dellaruse

Will fitting fuel pressure reg solve it?

TFS could be onto something there , i'm getting the feeling my fuel pump is struggling now and i see from your garage that you also run a GTR pump abd run similar power

400hp is probably getting to the limit on them it might be time for an upgrade

N=8 · 10-11-2006, 04:53 PM

Was it mapped on a dyno or on the road?

You could be using a cell in the ignition map that has not been mapped because the load on the engine on a dyno is different to on the road. It may just need a bit of fine tuning to the ignition map and a degree or two taken out of those cells.

dellaruse · 10-11-2006, 05:05 PM

Quote:

Originally Posted by N=8

Was it mapped on a dyno or on the road?

You could be using a cell in the ignition map that has not been mapped because the load on the engine on a dyno is different to on the road. It may just need a bit of fine tuning to the ignition map and a degree or two taken out of those cells.

Got it mapped on the dyno a month ago and have been back this morning for a check and this was done on the road, and some of the cells where fine tuned! but on the way back it started to happen again!!

Keith

dellaruse · 10-11-2006, 05:06 PM

Quote:

Originally Posted by Richf

TFS could be onto something there , i'm getting the feeling my fuel pump is struggling now and i see from your garage that you also run a GTR pump abd run similar power

400hp is probably getting to the limit on them it might be time for an upgrade

i thought these were good for 400+ tho Rich!

Richf · 10-11-2006, 05:09 PM

Quote:

Originally Posted by dellaruse

i thought these were good for 400+ tho Rich!

so did i but i'm no longer convinced.

dellaruse · 10-11-2006, 05:10 PM

Any recomendations on pumps

SPEARMINT · 10-11-2006, 05:11 PM

I might just have a look at this water injection lark.

T.F.S, seeing as you know the square route of **** all, what kit would you recommend?

dellaruse · 10-11-2006, 05:16 PM

Quote:

Originally Posted by Spearmint

I might just have a look at this water injection lark.

T.F.S, seeing as you know the square route of **** all, what kit would you recommend?

Mr mint

what fuel pump you running??

SPEARMINT · 10-11-2006, 05:21 PM

Nismo 280 litre per hour jobba thingy.

**Bill Oddie** · 10-11-2006, 05:23 PM

Quote:

Originally Posted by Spearmint

I might just have a look at this water injection lark.

T.F.S, seeing as you know the square route of **** all, what kit would you recommend?

lol

i use an aquamist but the best system i think is a noswizards system as injection rate rises with boost pressure but it needs a pressureised cylinder/bottle and this is normally metal, not great for alcahol

i will PM you with some info as you know im not allowed to post guides on here

the best advice will be from "JohnA" of the aquamist forum, a good friend of mine and also a mentor, speak to him!

precompressor injection is the way forward but im doing mine just before plenium

dellaruse · 10-11-2006, 05:24 PM

Anyone know what lph the GTR one's are then?

Richf · 10-11-2006, 05:25 PM

Quote:

Originally Posted by Spearmint

Nismo 280 litre per hour jobba thingy.

thats what i am going for

SPEARMINT · 10-11-2006, 05:29 PM

Quote:

Originally Posted by T.F.S.

lol
i will PM you with some info as you know im not allowed to post guides on here

precompressor injection is the way forward but im doing mine just before plenium

Yes, please do.

So, pros and cons of before the plenum or before the compressor section? What would they be?