Fuel pump upgrade?

[333pg333]

The 044 will be plenty of pump for those hp levels. In point of fact my mechanic still uses a stock pump (I'm 99% sure) and he would now have 350bhp easily with a 3L 16v turbo. If he doesn't, you could also try the 'HV' pump shown here. http://www.lindseyracing.com/LR/Parts/944BOSCHHVPUMP.html I believe it was a stock 928 pump for some time.
People say that the 044 can be a bit noisy although there is some conjecture as to the cause.

 

[pauly]

An AFR kit and external boost gauge can help but boost is addictive and people get greedy, on a road car you would hopefully hear the detonation and feel either the misfire or a suprising boost in power, the trick then is to get off the throttle quickly and dont keep boosting the engine until you identify the issue, some people don't seem to have any mechanical sympathy for a 20+ year old engine that has had it's overboost protection removed.

 

[944 man]

Youd hope that that would happen, but in practice most people with holed pistons and run cranks didnt hear anything...

 

[pauly]

ORIGINAL: 944 man

Youd hope that that would happen, but in practice most people with holed pistons and run cranks didnt hear anything...

Perhaps time running a Cologne V6 and a CVH on the edge of detonation honed my hearing a little, though I think the rings in the Capri had fluttered a little too often and were in several pieces when I sold it .

 

[Ewan]

Advice appreciated and decision made - JMG shall install their upgraded fuel pump. Another couple of hundred quid all in. But if it is likely to stop my newly rebuilt and upgraded engine from letting go, it's money well spent. I just hope none of you now try to persuade me that new injectors are needed also, along with an upgraded MAF kit and a larger turbo! I just hope I can pay the garage bill this weekend AND feed the children.

So place your bets - JMG have been working on my car since April. What will the bill be?!!!

 

[Frenchy]

Ouch !
If you are gonna be a bear be a Grizzly, couple of £000's coming your way by the sounds of it so what the hell, certainly not a bad thing getting one fitted, full report when on the road please []

 

[pauly]

ORIGINAL: Ewan

So place your bets - JMG have been working on my car since April. What will the bill be?!!!

A lot.

 

[Hilux]

ORIGINAL: pauly

An AFR kit and external boost gauge can help but boost is addictive and people get greedy, on a road car you would hopefully hear the detonation and feel either the misfire or a suprising boost in power, the trick then is to get off the throttle quickly and dont keep boosting the engine until you identify the issue, some people don't seem to have any mechanical sympathy for a 20+ year old engine that has had it's overboost protection removed.

You need to understand the difference between detonation (Knock) and pre-ignition.

Detonation is also known as `pinking` or `knock` and can be heard as the fuel ignites out of sequence and hammers the piston on the upstroke - On modern engines the ECU will be told of this phenomenon by the knock sensor/s and will retard or advance the ignition accordingly.

Pre-ignition is different and can destroy an engines very easily and quickly and is due to the combustion chamber becoming too hot (mainly due to a lean AFR and high boost - less likely due to ignition sequence) and a hot spot forming on a valve lip or plug tip or piston land edge that sets off the fuel out of sequence creating huge pressure and heat within the chamber. Generally it is the spark plug tips that cause it.

Production engines have much hotter spark plugs for cold starting and resisting sooting up. To avoid pre-ignition manufacturers ensure (via the ever more complex ECU`s) that the fuel/air calibration is just kept rich enough to keep the spark plugs cool at high loads and at high temperatures so that they don't induce it.

It isnt heard it just happens. All you will hear is the engine grenading, the knock sensor isnt designed to detect it quick enough to shut down the engine.

 

[TTM]

I don't see where Pauly confused pre ignition with detonation...?

 

[pauly]

ORIGINAL: TTM

I don't see where Pauly confused pre ignition with detonation...?

Neither do I.

 

[Hilux]

Detonation wont wreck your engine in a half second unlike pre-ignition whereas the thread is primarily about preventing poor AFR or lean running which can cause pre-ignition.

 

[Frenchy]

Sounds like a good idea to run cooler plugs on a tuned Turbo then ?

 

[pauly]

ORIGINAL: Hilux

Detonation wont wreck your engine in a half second unlike pre-ignition whereas the thread is primarily about preventing poor AFR or lean running which can cause pre-ignition.

Half a second, are you sure ?.