After a few years with struggels and some setbacks. We dynoed my car today, and with still some problems im happy with the results.

The dyno is a Rota Test wich is supposed to be one of the most accurate dynos in the world.

We did some tunning as well since it was running abit lean under pressure. And with some problems trying to get a stable pressure, we dynoed it to 299 rwkw, wich equals to 406.36 rwhp and 434.3nm of torque at the rear wheels. (cant covert it to ft.lb for u guys). This was at 1.15 kg of boost wich is about 17 psi. We tried to get it higher but it would just bleed out and drop to about 14.7 psi at 8000 rpm. And max effect was 7120.

The setup is a Extended street port with a T04E AR.96 P-trim. Using Hurley 3mm apex and 2 piece side seals. Autronic SM4 ecu, Autronic 500R CDI, Crane Cams LX92 coils. NGK B11EGV spark plugs. 4x1680cc injectors.

It starts to generate alot of boost at low rpms. This could be fixed by tuning the fuel and ignition alot better, but wanted to get a good map for racing next weekend.

JT

 

Rock and roll! Nice work. I bet the turbo is what's holding you up. Even the largest TO4E (60-trim) won't do much over 400rwhp. It's just not enough compressor.

Good choice on spark plugs! Great work! I bet the car is real quick.

B

 

thanks

it's a 60 trim compressor, could have helped maybe with a q trim exhaust prop. it's a p trim now. it might be some backpressure building up. but im not sure i want to push it more on just pump gas. AF ratios was about 11.7 on the entire map and about 16 degreese ignition

the car is pretty quick, looking forward to use it on the track next weekend. gonna race it then. gonna hafto fix the damn clunking sound in the back now tho.

not sure what it is, it gets quieter as speed increases. and it's horrible at around 1500-2200 rpms.

but looking forward to next weekend

 

nice #'s enjoy the new hosrepower

 

It's not enough compressor. That's the issue with it. We played with a couple derivatives of that compressor several years ago and produced nearly the same results.

B

 

That dyno bolts onto the hubs just like a dynapack

For your own comparison I dynoed 352rwkw on it on 19.9psi peak (6700rpm) and 18 odd psi at full revs power (7600rpm in my case) that was using 2mm apex seals and my own street porting.

Send me and e-mail riceracing@ozemail.com.au and I will forward you the run on the Autronic for you to view it

It was on a 57.8mm compressor wheel, H trim in a small TO4 turbo water injected pre turbo with my system P trim turbine wheel

At the wheels (on a dyno dynamics) with rubber losses etc this turbo did 325+rwkw at much higher boost on a not so well built engine again with my water injection system installed, even on 20b engines back here 15 years ago these size compressor wheels supported 330rwkw @ the rear wheels no problems (350~360+rwkw) in your dynos language. On the road it should blaze the tires on a FD in 3rd gear on throttle application if it does not keep on winding the boost into it

it will easily support 550 to 560BHP at the engine, seen it dozens of times, if your engine is capable and efficient enough.

3mm's make less power than 2mm all variables being like and Hurleys in particular have very high friction on the rotor housings, I have a set here that did not last a month in one high HP road car and they were very hard on the rotor housings ! dont be suprised if you loose over 8% or more in power from these two factors alone ! I have no idea what their side seals are like but after viewing how they fucked a set of rotor housings I'd say they would probably be just as bad lol

 

Hmm i see, well looking at the boost and max effect, i actually made max effect on 14 psi of boost. And not 17 wich was max boost. It dropped 3 psi from about 5500 rpm to 7000 rpm.

And another thing i noticed was that my boostcontroller was showing a 2.5 psi diffrence from the map sensor in the car and the dyno.

So im thinking maybe the plug im getting my boost signal from is starting to clog up. So im gonna try and move it.

But anyway im happy with the numbers, we did just a basic rough tune. Getting out the black spots, where the AF ratios would spike. And we smooth it out nice. From entering boost til 8000 rpm the AF ratio stays between 11.2-11.7 or so.

Running about 16 degrees of ignition at 14.7 psi and 13 and 22 psi.

Also im using a Blitz SBC ID to controll the boost, and it's set to Auto.

JT

 

Good to hear someone is dyno testing on a RotoTest! Nice numbers Jantore! I will be dyno testing 2 FDs in hopefully September. First the T-78 one that i started a thread about and another REW 13B with stage 1 street port and ported intake manifold with a Holset HX-40R turbo (60 mm inducer) and 23 turbine housing. Both cars have Apexi Power FC and SRC apex seals, corner and side seals. Have you done any 1/4 mile testing?

/Lasse

 

Nice dyno results

I dont want to rain on your parade, but I second what Rice was saying about the Hurleys----I broke many of them (2mm) back in 2000 and 2001, at around 325-340 rwhp. They're just too soft, and I will never use another Hurley product again. I hope you have better luck than I did!

 

Yeah i know alot of ppl have had problems with em. Ive been using the same 3mm now for 2 years and 4 months now. And i have eaten alot of side seals but no apex seals. But using hurley 2 piece side seals now. And it's working great.

Gonna take the engine apart again now in a few weeks, rebuild it and dyno it again. Then with some other 3mm seals, and a new front plate, since it's overported. Then deliver it to the new owner. Since it seams like the engine and the rest of the engine parts are sold

So a new engine is in the planing stages now. PP Port, GT40 88R E85, Mazda Motorsport dry sump NRS Seals, 12.7mm stud kit, custome intake, custome manifoild and downpipe. Alot will be fabricated by a freind of mine.

A new gearbox will be mandatory as well, since the stock one is starting to be a bit hard to shift with. So that's why Lasse i have not done any quarter miles. The gear box will just break.

Right now im having some boost problems where the boost drops to 0.85kg when going at it. It will peak at the set boost and then drop off. So not happy

JT

 

so the engine survived this weekends track racing, but the boost drop is starting to anoy me bad.

found a small leak in a vacume tube that had melted. and fixed that, wich gave me more boost, but still i had a massive boost drop. started at about 18 psi and drop down to about 13 psi wich is the spring rate. it seams like it just bleeds down to the spring. im not happy about that.

i also noticed some play in the turbo, when pushing the turbine in and out. maybe a few mm of play, not much but alittle.

any ideas?

JT