Glad to hear things went ok.

I have a couple of practical questions if thats ok?

Firstly at what RPM approx did you hit full boost?

Do you know what the injector duty peak on the 740's was?

Did the Exedy organic clutch hold up ok?

Finally, how does it feel, really?

Sorry for all the questions but as you know you're my guinea pig and your results and opinions will highly influence which path i take for turbo choice.

Many thanks

Daz

 

everything happens around 4000rpm.. possibly slightly lower if you go by electronic rpm rather than the tacho as it reads slightly high.. but peak is slightly higher than that.

740s peaked at 88 or 89% iirrc... @ 3.5bar atmospheric

clutch held no problem.

It feels rapid.. even below 4000rpm.. it is a lovely turbo!

Unsure why the boost peaked higher than I mapped it for.. will talk to Terry on the phone tomorrow and sort.. we tested it enough and was holding boost perfect.. perhaps just colder as Terry suggests.. but needs correcting anyway.

Simon

 

Thanks Simon - it certanly bloody quick isn't it

Daz - I'll give you the low-down

When mapping, I was flooring the throttle from 3krpm ish 4th and 5th, so I was ideally placed to see the boost guage/ rev counter and can answer your questions.

I would say that in 4th it was hitting 1 bar boost between 3500 and 3750 rpm then somewhere near full boost at about 4000rpm (it's hard to be precise because it just spools up so quick). I think in 5th it was probably hitting these boost levels up to 300rpm sooner.

The car accelerates like mad at 4000 rpm, then at 6000rpm it just seems to go ballistic - probably feels like that to me because my old turbo would be tailing off at this point - this one just feels like a demented mad man is just egging it on - I have the engine check light set to light up as a gear-change reminder at 6.5k rpm, but this was definately pushing like mad to well over 7krpm.

When you look at these figures, it may seem that as it is hitting high boost at a relatively low rpm, then it may not have much lag. It does have lag - so when cruising at 80 in 5th, with say negative boost pressure, you do feel the lag if you boot it from that point. I would say a bigger turbo on a 2 litre would have more lag and spoil the experience. This 321T is fine - you expect a bit of lag and then all hell breaks loose

Also managed to boot it through the lower gears (with caution in 1st and 2nd as I don't want to break the weaker gears ) and when it hooks up in 2nd and lag isn't really an issue here due to my low ratio RA gearing, it is unreal - smooth changes into 3rd, 4th and 5th and I'm sure there would be no other car that would keep up Give me a 911 turbo to play with and I'm sure I would be quicker through the gears.

So mate, I think the turbo is awesome. Give me more time today to get used to it and sort out the overboosting and I'll give you another report tonight

I'm hoping to get it on the rollers today, so may have a RR printout to share later.

Cheers

Terry

 

You should try it on a 2.5

 

Terry,

Nice one mate..... bet your well chuffed!

I think my new setup may have a chance of keeping up with you though!

 

Terry,

Glad you're pleased with it.

Do you know what your ratios are ? IIRC, the RA 4th is similar to a UK 3rd, and the RA 5th, similar to UK 4th ?


If that's right, and you're finding 5th is around 300rpm earlier, it's about what I had estimated the T would do on the 2.0lt, circa 1bar by 3200rpm, and full boost around 3700rpm. In your case, full boost being nearly 2 bar


Mark.

 

I may have missed it in the thread somewhere but what gearbox are you running or is it a Gearkit ??

 

Excellent results. I am worried about the GT30R being too laggy on a 2.0L. I will also have to go with a Maf sim conversion to go with my power FC if I went the GT30 route. So its looking that this has finally conviced me to with a MD321T.

Yours is a very similar spec to mine so I am thinking this will be an ideal choice of turbo. The only major difference is that I have UK six speed geabox which to be honest I seem to get through the gears very quickly.

Ironically the lightweight fly wheel made me hit the limiter if i nailed it in the low gears as it just reved so quickly. I now have a standard flywheel on (for the time being ) and that made the car more drivable and didnt hit the limiter so much.

So my thinking is that with the six speed box and a lightweight flywheel lag is NOT going to be an issue with the MD321T.

Thanks for the feedback too its very helpful for those of us that have big decisions to make.

Enjoy your high octane, adrenaline saturday driving experience. I shall look forward to your final synopsis later

Mark can you please PM me prices for everything needed to fit this turbo?

Daz

 

Daz - I don't think you'll be disappointed at all. I went on the rollers today but the readings were incorrect and couldn't get a proper run in - so will have to wait to get on some more rollers soon

I've just been out in it again - girlfriend now hates the car even more than ever The acceleration is just awesome. Good job I have the AVCR as I managed to tone down the overboosting I had last night, and it now runs very smoothly and very rapidly.

It is also very smooth and quick between gear changes - the turbo is always on the boil when you are giving it some

Cheers

Terry

 

I was very impressed with the turbo, I was expecting more lag and the turbo to be more of a switch and fussy with regard to the boost level - ie. have a point at which it came alive and would be a pain to keep in that area but not the case at all.. even going up through from lower boost to the higher boost we settled on it still felt alive at 1bar but just kept on delivering the goods as we turned the boost up further.. and then still delivering more when Terry persuaded me to turn it up further.. .lol do they do a club like AA for Boost junkies?

Simon

 

Simon.

Yes, but you have my telephone number


Mark.

 

lol.. I tohught I'd just fit both the GT30R's currently sat in my engine bay

Simon

 

It's president and founder member is one J Banks isn't it

 

hahaha i know that feeling

 

don't forget


the esses and bobbies are right,left.
not straight on

well,unless it's raining

 

roll on march when it's run in and ready for THE map

 

Something that I think some of you might like

Video taken today in car of my AVCR monitoring boost/ revs and starting in 5th at 3000rpm

MD321TAVCR.flv - Video - Photobucket - Video and Image Hosting

Pretty impressive turbo

 

F L E X I B L E !

 

that is spooling slower than when we mapped it. the duty adjustment to stop the overboost must now be too low. It also doesn't make the target boost due to this.. imho.

Will sort meeting up with you to tweak it Terry.

Simon

 

go into the AVCR settings and adjust the duty yourself, Terry

 

I have done mate, but if the boost is too high then we think it is blowing the spark out and therefore misfiring - so will be investing in an uprated set of plugs - NGK 8's maybe

 

tell me you're not runing 7s?! can't believe someone would turn up for a mapping session with the wrong plugs, hey Simon?

 

 

Well you learn something every day I wasn't aware that 7's wouldn't be up to the task and as no-one had kindly suggested this to me on this project thread, then I now find myself having to change. No big deal though

But never fear, it will be rectified - set of 8's winging their way to me as we speak

 

please don't take my word for it! hence the in my post, and probably the from Steven

 

LOL - that's ok Kev - no offence taken re yours or Steven's post


It's all good fun learning about these things - if everything went together 100% smoothly in the beginning, then I'd never learn anything.

So if I'm at say 80% potential currently, due to me turning down the duty cycle, etc - then I look forward t exploring the extra 20% when I have the plugs fitted

 

if your not in to much of a hurry to find out , hopefully on the next few weeks i will have my 2ltr all mapped up with a hybrid gt30r

 

or have to get from Kent to Derby after the mapping session to get to a concert eh Kev!! lol I still have a scar on my arm from that burn on the lambda I lent on hurrying to get the wideband out of the headers

Simon

 

I am having mine mapped on wednesday on a 2 litre so ill let you know or Simon can

 

My concern isn't on hybrid GT30's its with a full blown rotated garrett GT30R external wastegate setup. The last thing i want is for the car to lose its driveability.

But i think I have made my mind up judging by Terry's results and other factors such as the need for maf sim conversion etc.

Get it on the rollers Terry