Mi16 With Jenveys Mapped At Emerald

[jackherer 543]

Last week I took my 205 to Emerald to be mapped, the final result was much better than I expected and the only problem I had was a TPS that started to fluctuate slightly at part throttle but I just bought a new one as they had one in stock. This is the final graph:

 

 

This is the spec:

 

1.9 XU9J4

Longmans 4-2-1 exhaust manifold

Standard exhaust

Colin Satchell inlet manifold

Jenvey 45s

Piper vernier pulleys

Standard cams

Emerald ECU

 

I took a selection of different length trumpets with me and after a load of testing ended up using the shortest ones which surprised us all.

 

The car isn't MOT'd yet so I've barely driven it but the few goes I've had just resulted in loss of traction, I'm not going to find out what it is really like until the weather improves.

[jackherer 543]

[welshpug 1,657]

short trumpets isnt surprising if you have full length jenveys and a satchell inlet.

 

torque looks good.

[jackherer 543]

I mean really short, when Colin made my inlet he asked what trumpets I had so he could make the inlet to suit, I mistakenly told him I had 60mm trumpets when I actually had 40mm ones and we ended up using 20mm!



If I hadn't seen them on ebay for a good price I wouldn't have even had them with me, when I got there and John saw all the trumpets I had he said OK we'll try them all but it'll be the long ones (as in 90mm, I had 20, 40, 60 and 90 to try)

[petert 586]

Yep, 115kW at the wheels is excellent for standard cams, standard head and standard CR.

[Simes 248 2 Cars]

That's pretty good you must be pleased.

Mine is similar spec, same rollers but with cams, roughly 5bhp more.

[Sandy 191]

When you say better, are we talking about the peak figure or over-laying the lines at 4-6k? The other issue is, it's not just length that's important, trumpet shape is as critical; heavily flared trumpets (ie the norm) often rob the mid range.

[Tom Fenton 1,541]

Cracking result very well done, there's no free power on Emerald's rollers either.

[dcc 855]

Nice, similar figures to my xu9

[blandy 29]

interesting as i was considering changing my 60mm to 90mm trumpets next time i go on the dyno with a satchell inlet and 118mm long jenveys as assuming longer may be better but maybe shorter would prove more benificial

[welshpug 1,657]

its not really longer vs shorter, but right vs wrong

[jackherer 543]

That's pretty good you must be pleased.

Mine is similar spec, same rollers but with cams, roughly 5bhp more.

 

I re-read your thread before I went as I knew they were similar and I'm thinking of fitting some cams at some point. From looking at your pics I think they have different rollers now so I don't know how much difference that will make?

 

When you say better, are we talking about the peak figure or over-laying the lines at 4-6k? The other issue is, it's not just length that's important, trumpet shape is as critical; heavily flared trumpets (ie the norm) often rob the mid range.

You sound just like John @ Emerald

 

We actually saw higher peaks, 197 IIRC, with other trumpets but the best overall curve was this one, I definitely wasn't looking for a peak number, I went there with very low expectations so I wouldn't be disappointed.

 

Some of the trumpets I had were less flared and he was very keen on trying them but again they weren't the ones giving the best results.

 

I could see that it would take days or weeks and many more trumpets than I had to actually cover all bases but I think I got lucky with this one, we started with the really short trumpets, tried everything else I had then went back to them.

[Anthony 1,003]

From looking at your pics I think they have different rollers now so I don't know how much difference that will make?

Certainly looks different judging from the software - if nothing else, at least you've a nice smooth graph now unlike the old Emerald rollers where you'd normally get a spiky, jagged graph at the top of the rev range. I wonder if the new rollers is related to the fire they had there earlier this year?

[Bakes100 20 1 Cars]

Looks good Kieran, out of interest what sort of clearance are you left with to the slam panel with the Satchell inlet & short trumpets?

[jackherer 543]

Certainly looks different judging from the software - if nothing else, at least you've a nice smooth graph now unlike the old Emerald rollers where you'd normally get a spiky, jagged graph at the top of the rev range. I wonder if the new rollers is related to the fire they had there earlier this year?

I was going by the number of rollers, if you look at my video above the wheels are on a single roller but Simes' seems to be on a pair of rollers. They had this dyno before the fire, the secondary monitor survived and works fine but the case is pretty melted!

 

 

Looks good Kieran, out of interest what sort of clearance are you left with to the slam panel with the Satchell inlet & short trumpets?

A lot more than I expected, I'll take some photos later. I might revisit my air filter plans now.

[Andy 105 1 Cars]

Impressive and fills me with enthusiasm as my Mi1.9 will be pretty standard when rebuilt. I also have Jenveys and an Emerald and plan to go to Norfolk for the mapping when the car is all in one piece again.!

[jackherer 543]

Looks good Kieran, out of interest what sort of clearance are you left with to the slam panel with the Satchell inlet & short trumpets?

 

[welshpug 1,657]

that actually looks like quite a decent total tract length, very close to what you get on an 8v with 90mm trumpets and the usual inlets.

[pug_ham 244 3 Cars]

Very nice results Kieran, great figures for a mild spec & room to improve should you want to.

 

g

[Sandy 191]

There is the value of actually testing stuff, rather than endlessly discussing/theorising! What I've certainly learned, is that you often need to re-visit stuff at times, because what works great on one engine spec, won't translate necessarily onto another ostensibly similar one. Testing is king.

 

These are MaHa single roller, an entirely different machine in the way it operates and estimates flywheel power, to their previous TAT software on twin rollers. Be careful about making comparisons to the old rollers or others, rolling road results are never that literal. Also the MaHa wheels figures will typically be lower than other machines (single or twin roller respectively) in my experience and uses a steeper rising Tx loss curve. Repeatability of one car on one machine is the best you can hope for with rollers.

[jackherer 543]

I agree but without the discussion and theories on here in the first place, in large part by you, I wouldn't have done any of this.

 

Unfortunately my lucky streak with the 205 has ended, I'm going to have to take the gearbox off before I can try driving it, the lower rear engine to gearbox bolt has pulled the thread out.

[SweetBadger 94]

That's a bugger, I unwittingly drove around for years with that bolt missing (inc many trackdays) in my old 205 with no ill effects. I'd be tempted to just rely on the other three!

[Tom Fenton 1,541]

I reckon if you undo all the bolts you might be able to turn the box enough to get enough room to helicoil the casing without having to remove it!

[jackherer 543]

I'm definitely tempted Alex! Likewise I've also known them to be missing for long periods with no obvious ill effects but I've also seen them sag really badly as they come apart and it's not pretty.

 

Tom, that's a very interesting idea, I'll investigate that for sure.

[dcc 855]

Cable tie it, job done.