4722 replies to this topic

[Nev]

Oh joyous news, Nipper has passed his MOT ! As for spark plugs Steve, I have bought some NGK '9's after talking to a very knowledgeable bloke at NGK headquarters. He suggested starting on '9's and then dropping to '8's and so forth if they start carboning up on a regular basis. At the moment I am going to run the engine in with my old '6's but once mapped, I think the '9's will be fine as I rarely travel more than a few miles without booting it to help clear out the carbon Heat emisions from the engine is going to be massive. Assuming I get Nipper to 450 BHP, this means the engine will be making approx 340 KW of heat. Imagine 340 1 bar electric fires in the engine bay !!

[VXT Tim]

Great news. Massive drive out planned to get it run in in one weekend?

[Graeme Lambert]

Oh joyous news, Nipper has passed his MOT !

Great news Nev, now for the real fun to start!

G

[NickB787]

Oh joyous news, Nipper has passed his MOT !

As for spark plugs Steve, I have bought some NGK '9's after talking to a very knowledgeable bloke at NGK headquarters. He suggested starting on '9's and then dropping to '8's and so forth if they start carboning up on a regular basis. At the moment I am going to run the engine in with my old '6's but once mapped, I think the '9's will be fine as I rarely travel more than a few miles without booting it to help clear out the carbon

Heat emisions from the engine is going to be massive. Assuming I get Nipper to 450 BHP, this means the engine will be making approx 340 KW of heat. Imagine 340 1 bar electric fires in the engine bay !!

Well done look forward to seeing Nipper

Edited by NickB777, 06 May 2011 - 11:35 AM.

[siztenboots]

thanks for the info on the plugs great news for the MOT heatwise, its 1bhp at the fly , 1bhp waste heat down the exhaust , 1bhp waste heat into the oil/coolant

[Nev]

Yep, I'm hoping to get back in time this afternoon after work to insure and tax it ready for the weekend. God it will be nice to actually drive it around, even passively under 3500 revs. I have Jimmy, Lee and Joe coming round to use my garage for the full weekend to work on Jimmy's race car. Hopefully I will get a chance to put my new pads and discs on all round and bleed the brakes, as they are terrible at the moment. After that, the run in shouldn't take too long considering how keen I am to drive ! If I can get to Courtenay's for an all important remap prior to July I may even be able to come to the National. I recently heard that Mark Shead got 510 BHP out of the same turbo that I have (at just 1.8 Bar of boost), so the prognosis is looking good. Bearing in mind the Garrett GTX3071 can boost upto 2.5 Bar this means it could in theory creep close to pushing out 600 BHP. Having said that I don't intend to go that far, as reliability and drivabilty will be adversly affected. Happy days. Fingers crossed that nothing blows up... N + N.

[techieboy]

even passively under 3500 revs.

You'll be wanting more than 3.5k revs if you want to run it in properly. Taking it too easy contributed to the expensive death of engine one for me.

[siztenboots]

really bugs me to hear people quote "boost" figures like its a point scoring exercise, Courtenay should know better as its yet another easy to fake figure. Lets have them quote airflow or MAF figures if there so great. Boost just measures, (depending upon measuring point), either restrictions in your chargecooler/intake manifold/valves/exhaust manifold. sorry nev, I'm know you have researched this in depth, but we know thats not how the tuning market works.

[NickB787]

If I can get to Courtenay's for an all important remap prior to July I may even be able to come to the National. I recently heard that Mark Shead got 510 BHP out of the same turbo that I have (at just 1.8 Bar of boost), so the prognosis is looking good. Bearing in mind the Garrett GTX3071 can boost upto 2.5 Bar this means it could in theory creep close to pushing out 600 BHP. Having said that I don't intend to go that far, as reliability and drivabilty will be adversly affected.

Happy days. Fingers crossed that nothing blows up...

N + N.

600bhp And I thought I was mad

[Nev]

Point taken Steve. I know boost to BHP ratio is just one way of measuring VE. I have made calcs for the inlet CFM expected for my power requirements, which is why I have made my own MAF, as my calcs indicate that the so called 80mm Astra VXR MAF will flat line with the air demand at around 400 BHP. There is only 1 MAF you can buy to fit the Z20LET loom plug that can cope with > 400 BHP and that's the one that goes on the Audi S4. Its £150. I even rang Bosch up and go the calibration curve out of them after much hassle. The MAF I made cost me around £20 and should be good for measuring flow for around 550 BHP as it's I/D is 86.5 mm Thanks for the info Techie, I will be driving it to the point that it boosts up partially. But I have to be carefull that AFM doesnt go badly out of tollereance or it will detonate. If I can get onto an empty motorway/A-road I will be able to concentrate on the AFM meter and allow the boost to build fully (assuming the AFM isnt > 13 approx). I've got a 1 Bar spring in the wastegate, but the old map and AMAL valve will mean that it wont vent until at 22 PSI overboost and 18 PSI steady boost. This will likely mean the engine will badly underfuel at this level, even with my 5 bar fuel pressure reg installed (which provides approx 15% more fuel than the old 3.3 bar one). What makes you think your non aggrasive run-in on your old engine contribute to death? Did you bores glaze due to not enough aggresion ?

Edited by Nev, 06 May 2011 - 12:16 PM.

[siztenboots]

its a lot easier to compare different turbos by their cubic meters per second (m3/s), in pounds per minute (lb/min), or in kilograms per second (kg/s) whilst I'm not mad enough to push mine that hard in the revs to get 400bhp, I am close to the 400 ft-lbf on the original rods, pistons and bolts. So my flow rates read from my 80mm AMM do saturate it from what I can see. I am tempted to do what you have and fit the sensor into a bigger flow tube, but still keep fuel trims proportionally within limits. I don't have a flow vs voltage chart for the VXR AMM, but it would be nice to see what Bosch have given you.

[techieboy]

What makes you think your non aggrasive run-in on your old engine contribute to death? Did you bores glaze due to not enough aggresion ?

I'm sure it was one of the contributing factors but we couldn't really decide on a definitive diagnosis. Think the initial rebore was probably too conservative with the clearances needed for the new pistons/rings and there was an interesting wear pattern around the top of the pistons. That combined with running too rich a map and a way too gentle a run-in led to big oil consumption. Big oil consumption led to too little oil one evening at Silverstone and starvation through Brooklands and finally spun bearings and fuggered crank. Me driving it home 35 miles led to death of a Z22SE.

Although, miraculously, the uprated Eagle rods survived to fight another day.

Was a lot more aggressive this time around and it's a much happier engine as a result.

[The Batman]

lee had the same bore patterns so it suggests the original rebore was shockingly shite and when the pistons got to temperature they must have been forcing there way up and down

[NickB787]

600bhp And I thought I was mad

Sorry Nev, didn't mean for it to come over that way,

Just saying I was impressed with high 300s for me but 600 wow truly amazing

[Nev]

Thanks Techie, I will endevour to be a bit more aggresive with my run-in then. The engine does feel quite free already and revs up like a motorbike engine, when in neutral it almost impossible to keep the revs steady.

[spuk87]

Good news on the MOT pass. Look forward to your final result

[Nev]

Steve, the calibration curve and part number for the Audi MAF is on my website somewhere. When I rang Klassen he recommended this one or another that some V8 or V12 BMW uses.

[Nev]

Bah, the bloody water leak is getting too bad, so I've taken the rear clam off this evening and will replace the oil/water heat exhanger which is certainly one thing that I can see is leaking ! If I'm not too lazy tomorrow, I should have replaced it and have the clam back on for a test drive later in the day. Jimmy Jam came over in his car today with Joe to do some work in my luxury garage. I didn't think it possible to take both front + rear clams off, do some jobs and put them back on in just 6 hours!! Anyway he kindly took me out for a short spin at the end so I could get the 'soupercharger experience'. I have to say it was much as expected in term of smooth torque delivery and made me want to brown my trousers. It's been so long since I've been in anything faster than a Ford Focus TDCi. At one point it made me wonder why I wanter more than 300 BHP, as his seemed plenty fast enough ! Pip pip VX chums.

[Nev]

Hoorah, today I had a busy but profitable day. link here .

[Nev]

Crikey, pushed it upto 4000 RPM this evening... WOW, once that turbo spools my instant (nervous) reaction is to take my foot off the accelerator as it seems mental.