Works to do at V8 shortly on 4.0 HC

[CHIMV8]

New Clutch
New Stealth Cam
Ported inlets mannys etc
Upgrade 45 mmm trumpets etc
72mm Plenum
Pre cats removed
Lightened fly wheel


Want to keep the engine basically mechanically raw..no megasquirt etc just get the engine to its maximum perforformance with out muckin about with laptops etc

Have i missed anything....Rob V8 Racing if you are looking in and think i should add something let me know

Cheers

Edited by CHIMV8 on Wednesday 17th August 19:47

Edited by CHIMV8 on Wednesday 17th August 19:48

[haircutmike]

A set of Rob's heads of course!

[CHIMV8]

haircutmike said:

A set of Rob's heads of course!

Bloody hell forgot those as part of the original list

New Clutch
New Stealth Cam
Stage 3 heads
Ported inlets mannys etc
Upgrade 45 mmm trumpets etc
72mm Plenum
Pre cats removed
Lightened fly wheel


Want to keep the engine basically mechanically raw..no megasquirt etc just get the engine to its maximum performance with out muckin about with laptops etc

Have i missed anything....Rob V8 Racing if you are looking in and think i should add something let me know

Cheers

Edited by CHIMV8 on Wednesday 17th August 19:49

[Chilliman]

72mm plenum and smooth bore induction ?

[Simon says]

Providing you get the thing to fuel correctly that should make for a real sweet motor it will certainly buzz round the tacho nice spec

[CHIMV8]

Well, dropping her off at Robs tomorrow morning for a couple of weeks(wont take that long,but he has other projects on, and its easy for me to drop her off now coming all the way from Yorkshire on route elsewhere)

Fingers crossed all goes well, and its as good an upgrade as i am expecting, 125 miles run back to find out and enjoy

[Chilliman]

CHIMV8 said:

(wont take that long,but he has other projects on,

And one of them's MINE

[V8FROG]

looks like the mods i am getting on mine.but with megasquirt and MC1 cam...but mine not HC...

[domV8]

Hasn't tests shown 45mm trumpets/72mm plenum to do virtually nothing for 400's..?

I put the same on my fairly modified 450 (see profile) - cost the best part of £1k inc. 45mm inlet manifold - and only managed to get an extra 10BHP, and that's from a rebuilt 4.6 with aftermarket ECU/remapping.

IMO I would suggest you forget these, and spend the money elsewhere - as I believe that unless you were looking to be revving v.high (prob. 6000+), then you will see little/no benefit top-end whilst losing low-down torque.

HTH,

Dom

[haircutmike]

I fitted V8D stage 4 heads, ported inlet, 45mm shortened trumpets etc and gave a 70 bhp increase at the same RR, I think it must have taken steroids for the 2nd run .

[V8FROG]

haircutmike said:

I fitted V8D stage 4 heads, ported inlet, 45mm shortened trumpets etc and gave a 70 bhp increase at the same RR, I think it must have taken steroids for the 2nd run .

wow really???so it is actually possible to get a 400 to make the same power as a 500!!!how much and what will u have to do to get near 300hp from a 400???

[Chilliman]

I'd start by increasing the capacity to 5.0 litres

[SILICONEKID340HP]

V8FROG said:

looks like the mods i am getting on mine.but with megasquirt and MC1 cam...but mine not HC...

Frog The HC means High lift cam don`t know the spec ,pocketed pistons and i think double valve springs..
The only reason your going for the MC1 cam is its touch and go it will hit the pistons ..If you had the pocketed pistons you could go for the Stealth cam..

Edited by SILICONEKID340HP on Thursday 18th August 17:31

[haircutmike]

Chilliman said:

I'd start by increasing the capacity to 5.0 litres

That was a 4.6 litre.

[CHIMV8]

We've all got opinions on this subject and i do take what you are saying,but at the end of the day, i have currently a totally restricted 3.9,i discussed what was considered worth while and what wasn't with Rob, and basically which road to go, without what we considered wasting money for very little gain.

I am happy with the choices we've made and agreed a tidy price for this lot,and there is no doubt it will be totally improved engine and Rob's workmanship will ensure that.

[v8 racing]

domV8 said:

Hasn't tests shown 45mm trumpets/72mm plenum to do virtually nothing for 400's..?

I put the same on my fairly modified 450 (see profile) - cost the best part of £1k inc. 45mm inlet manifold - and only managed to get an extra 10BHP, and that's from a rebuilt 4.6 with aftermarket ECU/remapping.

IMO I would suggest you forget these, and spend the money elsewhere - as I believe that unless you were looking to be revving v.high (prob. 6000+), then you will see little/no benefit top-end whilst losing low-down torque.

HTH,

Dom

It seriously cost you 1k for a 45mm inlet 45trumpet base and 72mm plenum? (ouch:-)), the 45mm trumpets and a matched inlet manifold are where the biggest gains of the three are, around 20hp gain, this is based on using ported heads, the plenum is worth about 5-10, again based on a 400, so a total of 25-30hp, if you only gained 10 from all three parts there must be a fault elsewhere that is ready to unleash some more power for you!

[CHIMV8]

v8 racing said:

domV8 said:

Hasn't tests shown 45mm trumpets/72mm plenum to do virtually nothing for 400's..?

I put the same on my fairly modified 450 (see profile) - cost the best part of £1k inc. 45mm inlet manifold - and only managed to get an extra 10BHP, and that's from a rebuilt 4.6 with aftermarket ECU/remapping.

IMO I would suggest you forget these, and spend the money elsewhere - as I believe that unless you were looking to be revving v.high (prob. 6000+), then you will see little/no benefit top-end whilst losing low-down torque.

HTH,

Dom

It seriously cost you 1k for a 45mm inlet 45trumpet base and 72mm plenum? (ouch:-)), the 45mm trumpets and a matched inlet manifold are where the biggest gains of the three are, around 20hp gain, this is based on using ported heads, the plenum is worth about 5-10, again based on a 400, so a total of 25-30hp, if you only gained 10 from all three parts there must be a fault elsewhere that is ready to unleash some more power for you!

Pheeewwwww...

Edited by CHIMV8 on Thursday 18th August 22:14

[domV8]

v8 racing said:

It seriously cost you 1k for a 45mm inlet 45trumpet base and 72mm plenum? (ouch:-)), the 45mm trumpets and a matched inlet manifold are where the biggest gains of the three are, around 20hp gain, this is based on using ported heads, the plenum is worth about 5-10, again based on a 400, so a total of 25-30hp

Parts (45mm manifold - 45mm trumpets/base - 72mm plenum)
Labour
Remapping Emerald

...came to around £1k. (although had stepper removed and IACV installed instead, included within that).

When you look at the before/after..:



...then you can see that the torque band has been shifted up by about 400rpm and is *marginally* higher (now 330lb.ft)...

I discussed this here, and have come to the conclusion that the cam characteristics meant that gas flow was not being limited by the 38mm trumpets (or was borderline).

I think the question resolves to:

Does a 4.0l with it's given cam characteristics flow enough for 38mm trumpets to become a bottleneck, and therefore warrant the increase to 45mm across the whole intake and the plenum bored out to 72mm..?

On my 4.6l with TVR885 cam - it would appear apparently not (at least not when mapped on 95ron).

And while the stealth cam is obviously a different profile to the TVR885 (and presumably has the torque at a higher rpm?), there is the reduction in displacement as compared to mine...

I would have thought that at a lower displacement - you would require quite a hot cam (ie. hotter than Stealth or 885) to hit this bottleneck...? [Please note, this is IMO based on my upgrades and experiences]

Dependent on the starting point (standard TVR 38mm "tubes") - I would like to compare the benefits of upgrading trumpets only to 38mm (with their improved shape, shorter height etc) vs. upgrading everything to 45mm at much greater cost...

With regards to the plenum, there was a thread here over the last 1-2 months (resurrected?), where someone said they had been testing plenums on the 400's back-to-back, and the 72mm achieved virtually no gain.

My point to the OP is that he may be able to save himself a lot of money and gain the same or almost as much by simply upgrading to aftermarket 38mm trumpets - as it may be that 45mm is too large for the 4.0l/cam set-up, and may actually result in slower gas speeds which might negate any notional gains...

Be a shame to spend hundreds of pounds up front, to find out they achieved v.little gain (speaking from experience here...;))

v8 racing said:

if you only gained 10 from all three parts there must be a fault elsewhere that is ready to unleash some more power for you!

If you can point me in the right direction - I will be eternally grateful...!




Dom

[V8FROG]

i am also looking to get more from my very good condition engine...now have ACT elbow,ACT 38mm carbon trumpets(actually felt the difference)k&N filter,custom exhaust from front to back and thats all.looking in a near future at new cam(MC1 i guess)and megasquirt(fueling).what else shall i do???(not changing to a 5litres).!!!so plenium 72mm not really sure to get anything from it right???

domV8 said:

If you can point me in the right direction - I will be eternally grateful...!




Dom

[Alexdaredevilz]

I installed 45mm trumpets and self ported base

removed cats

M/A best guess chip

Act induction kit

And here is my before and after

Cost me no more than £200 and that includes buying die grinder

Edited by Alexdaredevilz on Friday 19th August 18:49