Ive made no comment about 1300bhp turbos so Ive no idea where you got that idea from.

Correct im sure that from my replies you would indeed hardly think so, as Im a fairly inteligent guy and have a lot of first hand experience of engines and single turbos, and I am familiar with people setups who have done twin turbos both on petrol engines and on diesel and how they work and what issues they had sizing turbos etc, I am sure it does come across as me knowing a lot about it. As the reality is of course that relative to the vast majority of people on here I do, even though I havent done it personally. This is the reason I stated that I havent done it as I wouldnt want to ever give the impression I had done something when I havent.

Ive never done any such thing as to the best of my knowledge Phil has never read a book, I used to have a go at him for repeating advice he was given, but not doing so in the right context because he didnt understand it in the first place so he would repeat it wrong.
Massive difference between him spouting off shit he didnt understand, and me talking about things I do have a good understanding of, but if you cant see that then its your issue not mine TBH

Agreed.

 

we, the pf jury, find you, chip, guilty of something* because, even though we may agree with your answers, you wouldn't spend so much time setting your case out like you have if you wern't


i'd ask mike a question, but i think he's being too nostalgic about his saph for the time ebing





*probably "too much time on your hands"

 

If you did it that way around, it would be the small turbo that dictated the total power not the larger one, you would overspin the small one long before the big one started to make proper power.
You would need some form of bypass to allow the big turbo to breathe in NOT through the smaller one once it started to spool the big turbo.


The volkswagon compound charge setup works with a bypass like that too, also known as a k-gate, and that is how I am going to do it on my nova if I ever do compound charge it with a supercharger like I had planned to originally, the problem I have though is that the gt35R I have on there spools up so well anyway just from the engine, that Im not convinced that slightly more torque lower down is worth the fact that it will cost me horsepower up top. On one hand I want to do it "just because" but on the other hand im not convinced it will improve the car if I do and it will make it a fair bit heavier of course and introduce another major component which could fail and cause damage (another belt setup)

 

I know its not politically correct to say it as we're all meant to be equal etc, but IMHO the reality is that given the same amount of time I am able to learn more than most on here can (only most not all of course, im sure there are quite a few folk on here cleverer than me so dont get the wrong impression from what I am saying), so it may look like I invest a lot more time in learning than I actually do, can we go back to talking about engines not me though, its a lot more interesting IMHO

 

Cool mike bad timing i could have bought your old one already done

 

Makes so much more sense that way around, if you can find a GOOD modified example it will save you a fortune!

 

i've learnt a hell of a lot reading posts here on pf and other forums, i can say that there isn't a lot of stuff that's gone over my head and i don't have a clue about, but when that sort of stuff does come along, as long as people don't get all techy about it, it's fairly easy to understand the basics of it without understnading the complicated bits of it as you read into what's what and what's not

it's like compressor maps, i know what they do, but i probably wouldn't beable to decipher one and pick a turbo to use without help

i know the top speed stuff that rod goes on about and understand what he's on about, but i coldn't explain it to someone else as i don't think i'm articulate enough to do so in a few words

the subject at hand about twin charging that you seem to have nailed in the last post, is it really worth the extra potential problems when you can do virtually the same now with just a bigger turbo and no charger?

in your case i'd probably say the extra wouldn't be worth the agro, but for someone who just wants to do it to see if it can be done or not, i'd like to hear more about ava's twin set up to see why it's been binned and if anyone has every tried to resurect it

like you in a way, i don't mind spending time trying to understand things, but, unlike you, i don't seem to be able to grasp concepts unless they are put very basicly to me and then complicated, you seem to be able to disassemble idea's to their component parts very easily and explain things to the rest of us

 

Totally agree chip you live & learn

 

Yep, it now has a Stack like my Escort, Recaro race seats up front, big brakes, LEDAs etc etc .

I'm sure it's not too late .

 

How much is he after then?

 

Chip, Whats the bore / stroke of the XE lump comared to a YB?

 

XE is 86mm * 86mm mate.

YB I cant remember off hand, think its something like 90.8 * 77.0 though.



Basically the XE is a narrow bore and a longer stroke, it has more in common with an EVO really in that respect than a YB.

 

very similar to a Zetec Engine as well

 

I was just wondering as you say you have excellent spool up on a GT35R? Be very interesting to know how much of a difference the bore/stroke ratio affects the boost threshold (ignoring ports/cams etc)..

What sort of RPM's are you seeing initial spool, positive pressure then full boost?

 

Its making just under a bar by under 3500 in the higher gears, the boost control doesnt allow it past that yet as Im only running that boost pressure fullstop currently, but I would expect it to be fully on song under 4000rpm.

The thing is though, its the off boost performance that is making me feel the supercharger isnt needed, because of the very unrestrictive inlet and exhaust arrangement and the N/A cams I am running, it just drives like a normal XE engine until it comes on boost, its not totally flat and gutless like a YB is off boost.

 

I would imagine it feels nice off boost due to the long stroke, gives a lot better low down torque... Strange that a YB struggles as a 2.0 to use a GT35 effectivley , My saff is currenly on a T4, but I have a GT35 sat ready and waiting, but I have been put off by a lot of people going back to Gt30's and reporting that they are much better...

Are you aiming for 500+ in the end then?

 

and

 

The other thing that makes it weird, is my cams are SO much hotter than YB ones, they are IIRC somewhere between DB14 and BD16
(252 duration, 10.5 mm of lift)
So you would expect if anything it to be worse than the YB on its mega mild cams potentially.

Personally I think on both engines a 3076 is the best way to 500bhp though, the gt35r is far less responsive than the 3076

Im aiming that way mate yes, although wether i will get it first attempt or have to make some changes remains to be seen.

 

Speaking of someone who went from a GT35 to a GT30 , what were your thoughts on this Porkster?

 

Im sure porkie can give a proper analysis, but based on my limited experience of driving his car on both turbos, it was NIGHT AND DAY different, hardly any drop in power and the way it was delivered was just amazing on the 3076 compared to the 35, the 35 was laggy, had a higher boost threshold and surged its tits off at certain points, the 3076 just felt quite literally perfectly matched to the engine, it just went like fuck everytime you presse the loud pedal no matter where in the rev range you were and what you were doing (well from 3K up anyway) and no surge or any hint of a problem.

It was a completely different car, I know that sounds like some massive exageration, but it really isnt IMHO!

 

Not like he needs the money really so a bit unfair not to give it to you at a nice price

Then again...not like you cant afford it

 

On my cossie that´s made for drag my gt35 1.06 had full boost(2,1bar) @ 4500 and 1,2bar @ 4000rpm, dont think thats bad for a cossie engine...
But hey, i´m only doing this for fun so nobody has to listen

 

And yes, it surges it´s tits off unless your on wot but i can live with that as ive got full boost from 4500-8000+rpm and that´s where i need it

 

Whats your full engine spec? Have you got any graphs?

 

Std cranck
Longer rods
7,5 comp
Portet head with std valves
Bd16+ inlet bd14 exh
sweedish plenum with bigger throttle
Peterg manifold tial 44mm Wg
Gt35 1,06
etc etc etc

Havent got a graf yet as it blev the headgasket cause it had a short peak @ 2,9bar so am just about to put it back together again

 

Sounds very impressive mate, especially on stock stroke!

 

What power/torque is that making?

 

Only graf i have is for ground mapping and that is only 0,8bar so not much worth, and 2,1bar was done on the road(we dont have so many RR in denmark)
Only thing i have is a log that state it was 8,7 sec 0-200km/h

 

Thats very good accleration.

Gotta be 600bhp then realistically!

 

Maybe, was guessing 500-550 my self but it blew up shortly after so...
I think i have to get some video of it this time

 

If its still anything like normal road weight, I dont see how it can possibly be only 500bhp and do those numbers mate!

YUM did 0-100mph in 7.3 IIRC
So 0-125 in 8.7 sounds like similar acceleration to me, and that was well over 600bhp

 

Ok, well it was me and the mapper, full cabin plus some tools and 18" comp mo´s so maybe your right, all i know is that i was having problems just controling it cause the suspension is to soft, so my mind was on just keeping it on the road

 

Well when its back together, I would love to see a graph if you do get to some rollers

 

Accleration of Martins Escort V1 with 617bhp & fully stripped out.

0-60 2.87
0-100 6.18
0-125 8.6 ( measured from Martins graph of accleration)

Your right Chip in a fully laden car at least 650 needed to get those times.

 

Rod,

what was your 0-125 time?

 

well as i said, it was only a log and i will of course get a graf when it´s ready again

 

Still catching Martin at that point 9.4secs. in old Spec.

 

I assume that was all off gas to that speed on the old spec?

 

I disagree actually mate. Marts Escorts have NEVER been light!!!

The cages weigh alot! as do big old 8 pot brakes and other uprated parts... I reckon its ALOT heavier than you think chaps.

yes it was dyno'd at that but...

IN CAR though... it was running on a 3' mongoose and a standard Rs500 cooler and all the ancillaries....

be surprised if it was really making any where remotely NEAR that much in car!

 

Id imagine his old one was lighter than the new one?

Cages do indeed weigh shit loads, but so do the standard escort seats etc


What do you think it weighed?
1300kg?
more?