Performance Modifications

[axsaxoman]

Hi,

I have just joined as I thought this was best way to tell all you c1 owners of our latest tuning exploits

we are well known for our conversions on saxo,s , ax,s ,106 ,etc

our name GMCmotorsport

www.gmcmotorsport.co .uk

Our latest thing is ==and this is very new

a performance exhaust system and decat manifold for the c1

next thing will be a super charger kit if there is any interest .

today we fitted the first system to a c1

results were an increase in power of between 5 to 9% at the wheels, depending on rpm ,and that is still with cat and std ex manifold fitted

the system has a rolled edge tail pipe which exits below bumper.

we also have made a twin exit system --If there is enough interest it will also become a stock

 

tomorrow we will be fitting the "bunch of bannanas " with no cat .

prices will be listed in our website early next week

wehave stock now

they are fully s/s of curse and are very easy to fit

 

thank you for taking the time to read this blatant advert

[TurboSlag]

How much for the supercharger (if you do it) and what improvements will it offer over the tried and tested TTS supercharger conversion?

 

Any photos or details of the exhaust? 9% is remarkable, nearly 15% increase.

 

I'm just in the finishing stages of fitting nitrous to mine, so i'll let you know how that goes.

[axsaxoman]

How much for the supercharger (if you do it) and what improvements will it offer over the tried and tested TTS supercharger conversion?

 

Any photos or details of the exhaust? 9% is remarkable, nearly 15% increase.

 

I'm just in the finishing stages of fitting nitrous to mine, so i'll let you know how that goes.

photo,s and power run graphs will be posted next week when we have tested the manifold

I was not suprised at the increase ,due mainly to "peashooter size bore of the std system and only I silencer ,which must kill the torque at certain rpms.

when I do the s/c conversion the parts will be very similar to what TTS does ,but engine mangemnt will not be the same,--thats where our 30years of knowledge usually allows us to gain power on our conversions.

My only worry is if its worth doing

if there are enough people interested in spending this kind of money on a c1.

what ex system or manifold is the TTS conversion using

[axsaxoman]

turboslag

 

unless you chage the std sysem to something better what ever power mods you make will never return the results they should do.

what mods have you done to your car

[axsaxoman]

How much for the supercharger (if you do it) and what improvements will it offer over the tried and tested TTS supercharger conversion?

 

Any photos or details of the exhaust? 9% is remarkable, nearly 15% increase.

 

I'm just in the finishing stages of fitting nitrous to mine, so i'll let you know how that goes.

 

I rang richard at TTS today

they have only done one car and its appearing in "banzai" mag this month .

they used a piggy back ecu to add fuel with an extra injector.

that car has a decat manifold +system ,but he was being vague as to its origin --probably will say in the article in the mag

 

I am not ready to publish pictures of the system yet as i want to alter a few details .but the end result was 19% increase in power ' wheels with manifold - system --but just a little noisey with both fitted for my taste.

[TurboSlag]

unless you chage the std sysem to something better what ever power mods you make will never return the results they should do.

what mods have you done to your car

Induction kit, Nitrous oxide (NOS dry kit, modified by myself to run wet with my own fuel circuit and a generic fuel solenoid 133bhp @ 5800 RPM). The Bottle is out and the fogger removed cos its going through the channel tunnel tomorrw and they don't allow compressed gas bottles down there. I only fitted the induction kit to give me somewhere to mount the foger, though the kit did move a lttle power from the top end to the mid range where it's more useful. I'm not risking any more shove - the TTs modded Aygo is running reliably at 139bhp so I don't wish to exceed that. a nice genuinecarbon fibr engine cover tops that off.

 

I don't recall dissing the exhaust - indeed, I said the gain was "remarkable" and if they can slip up a dyno plot to show that it's a genuine increase, and simply not gained at the expense of the power elsewhere, then it's very good indeed. Perhaps the word "remarkable" means something else these days, like 'bad' now means 'good'?

 

As for the res of my car, SP grille, SP arches, genuine Ciroen Sport front springs, 15" alloys (195/50 15), pug XS backbox conversion, pug fron fogs, tints, rev counter, pro colour coded interior, rear interior stripped, 3 point harnesses, OMP pads, Sony head unit, Kenwoods up front, Juice 5.5 inchers in the rear, carbon gear lever shaft, courtesy light on passenger door, sill plates, and my favourite mod of all...the Lotus gearknob - worth 15bhp, easy :lol:

 

I am not ready to publish pictures of the system yet as i want to alter a few details .but the end result was 19% increase in power ' wheels with manifold - system --but just a little noisey with both fitted for my taste.

Idoes it maintain the cat and is it all legal noise wise? If the answer is yes, I might be interested. What are the prices for a full or rear system?

[axsaxoman]

Induction kit, Nitrous oxide (NOS dry kit, modified by myself to run wet with my own fuel circuit and a generic fuel solenoid133bhp & 5800 RPM). The Bottle is out and the fogger removed cos its going through the channel tunnel tomorrw and they don't allow compressed gas bottles down there. I only fitted the induction kit to give me somewhere to mount the foger, though the kit did move a lttle power from the top end to the mid range where it's more useful.

 

The engines capacity and lack of available mods makes a free flowing exhaust pointless as a performance tool, as it's not like you'll find cam to take advantage of it.

 

nonsense

if the std ex system is resrticting power on std car then it damn sure is if you make more power --

 

whatever you have with your nos kit you will get more if you make it easier for it to breath .

 

the first rule on tuning is to increase the effiency of the engine ,

and a 19% gain by decreasing the back pressure caused by the "peashooter" exhaust must help with all other mods.

there is no problem in getting a sporty cam made

there just needs to be a market for it

same as TTs has found with the s/c kit --not many people want to spend 3K on a 6K car

[TurboSlag]

Yeah, then show us the plots. I'm very interested, but want to see the curves. conventional aftermarket exhausts on their own often (but NOT always) give little and usually shift the area around under the graph rather than a NET increase. I'm not disbelieving you, but we've heard it before so many times (though your company has a good rep :lol: ) and your numbers are very good, so show us the plots (before and after, same day if possible to avoid atmospheric abberation) and you've got one very interested punter.

 

I'm a bit anal about gas flow and fluid dynamics, having a masters degree in Celestial Mechanics and minored in hypergolic rocket propulsion systems, though im going back to science rather than engineering for my PhD.

[Martin_1973_uk]

I thought with NOS you shouldn't up the BHP of an engine more than 25% as it can make the engine very unreliable and likely to blow the head gasket etc? Have you had any problems with this?

[axsaxoman]

Yeah, then show us the plots. I'm very interested, but want to see the curves. conventional aftermarket exhausts on their own often (but NOT always) give little and usually shift the area around under the graph rather than a NET increase. I'm not disbelieving you, but we've heard it before so many times (though your company has a good rep :D ) and your numbers are very good, so show us the plots (before and after, same day if possible to avoid atmospheric abberation) and you've got one very interested punter.

 

I'm a bit anal about gas flow and fluid dynamics, having a masters degree in Celestial Mechanics and minored in hypergolic rocket propulsion systems, though im going back to science rather than engineering for my PhD.

If i can work out how to upload apicture on this site I will.

I am an old fart and deal with windows as little as i can

[TurboSlag]

I thought with NOS you shouldn't up the BHP of an engine more than 25% as it can make the engine very unreliable and likely to blow the head gasket etc? Have you had any problems with this?

No, I haven't. Unlike nitrous sytems of yore, mine is a wet set up and i've deliberately set it to run a little fuel-rich so this is not a problem I will encounter. I could keep turning the screw and go up and up until the sheer intertial forces break something. However, as aforementioned, TTS are running a safe and reliable 139bhp with a supercharger, so an occasional 133 should be positively cosseting. I am confident that I am well within the phyisical stuctural limits of the engines architecture.

[axsaxoman]

If i can work out how to upload apicture on this site I will.

I am an old fart and deal with windows as little as i can

 

 

test1 is std car

test3 manifold + system using std sealing arrangement

test8 is with manifold + system--with restriction removed caused by std seal

done on same day and g/box wramed for 10mins before each run

[TurboSlag]

Some good curves, with no losses and a nice phat mid range and top end. You thought of trying to reduce the diamete just a touch near the centre of the system and open it out wider behind to inrease gas velocity and try to shift some of that top end back to the mid range?

 

Either way, i'd be nitpicking to say that isn't a stellar result. Is the 2nd run the system that maintains the cat in place?

[StormB]

test1 is std car

test3 manifold + system using std sealing arrangement

test8 is with manifold + system--with restriction removed caused by std seal

done on same day and g/box wramed for 10mins before each run

 

I'm interested, based on this. How much?

 

Will

[axsaxoman]

Some good curves, with no losses and a nice phat mid range and top end. You thought of trying to reduce the diamete just a touch near the centre of the system and open it out wider behind to inrease gas velocity and try to shift some of that top end back to the mid range?

 

Either way, i'd be nitpicking to say that isn't a stellar result. Is the 2nd run the system that maintains the cat in place?

 

It is too noisey really at present making it largerat rear will just make it harder to quieten it down .

If anything i will be reducing the front half .It has a centre box at present ,but it is doing nothing I think .

 

.

the system on its own keeping std manifold and cat give around 9% increase in power and it is quieter

 

more news as things develop