corsasport.co.uk
  Not logged in [Login - Register]  
You Are Not Registered Or Not Logged In  

Corsa Sport » Message Board » General Chat » manifold test results


New Topic
New Poll 		  Subscribe | Add to Favourites

You are not logged in and may not post or reply to messages. Please log in or create a new account or mail us about fixing an existing one - register@corsasport.co.uk

There are also many more features available when you are logged in such as private messages, buddy list, location services, post search and more.


Author manifold test results
Dave A
USER UNDER INVESTIGATION - DO NOT TRADE

Registered: 10th Dec 03
Location: County Durham
User status: Offline
11th Oct 07 at 11:39   View User's Profile U2U Member Reply With Quote
after lots of testing this are the final results to show the real difference between a 4-1 and 4-2-1 manifold. the Black line is the 4-2-1 item, as you can see its slightly better in the 2400-3000 rpm range and in the 5200-6600 rpm range it is slightly better but the 4-1 is a smoother graph and gives power for an extra 2-300 rpm later in the rev range.




different engines will respond differently but goes to show that there isnt as much difference as you might think!

Dave
Iain M
Member
Registered: 18th Aug 05
Location: Wigan - Drives 272bhp corsa ZLET
User status: Offline
11th Oct 07 at 11:41   View User's Profile U2U Member Reply With Quote
so which would you reccomend for the money
gianluigi
Member
Registered: 9th Mar 05
Location: Ipswich, Suffolk
User status: Offline
11th Oct 07 at 11:42   View User's Profile U2U Member Reply With Quote
good test there dave
Dave A
USER UNDER INVESTIGATION - DO NOT TRADE

Registered: 10th Dec 03
Location: County Durham
User status: Offline
11th Oct 07 at 11:44   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by Iain M
so which would you reccomend for the money



id happily have either. one of the manifolds in that graph is £180 and the other is £500+

make your own mind up
Dave A
USER UNDER INVESTIGATION - DO NOT TRADE

Registered: 10th Dec 03
Location: County Durham
User status: Offline
11th Oct 07 at 11:45   View User's Profile U2U Member Reply With Quote
also bear in mind that on different spec engines you will get completely different results.
Iain M
Member
Registered: 18th Aug 05
Location: Wigan - Drives 272bhp corsa ZLET
User status: Offline
11th Oct 07 at 11:49   View User's Profile U2U Member Reply With Quote
How come thou the price is so far apart and yet performance isn't?
Jenko_Sport
Member
Registered: 25th May 06
Location: Stoke-on-Trent
User status: Offline
11th Oct 07 at 11:52   View User's Profile U2U Member Reply With Quote
Which monifolds have you tested just out of interest?
Paul_J
Member
Registered: 6th Jun 02
Location: London
User status: Offline
11th Oct 07 at 12:00   View User's Profile U2U Member Reply With Quote
did u remap the engine after changing each manifold?

would this matter?

so if I whacked a 4-1 mani on my car (which already is mapped with cams and with a 4-2-1) would it be ok, or would it ruin the map...

my mate had a gti with the 4-1 and it pulled hard to 7800 rpm, mine with 4-2-1 pulls hard to 7200 and then runs out of steam a bit... been tempted by 4-1 for years.
Vaux Lad
Member
Registered: 15th Dec 04
Location: Stoke-on-Trent
User status: Offline
11th Oct 07 at 12:01   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by Iain M
How come thou the price is so far apart and yet performance isn't?

Depends who sells them tbh.

For example, say Sportex sold one for £150, and Sbd sold the exact same type, youd expect SBD to charge more, just due to there name etc.

Ideally the map will need a tweak when changing a manifold, as its changing the breathing characteristics.

Dave-Was that a protec 4-1?



[Edited on 11-10-2007 by Vaux Lad]
Lee Wilson
Member
Registered: 20th Feb 06
Location: Fareham, Hants Drives: XE Corsa
User status: Offline
11th Oct 07 at 12:01   View User's Profile U2U Member Reply With Quote


I'd definatly go for the cheaper one
Iain M
Member
Registered: 18th Aug 05
Location: Wigan - Drives 272bhp corsa ZLET
User status: Offline
11th Oct 07 at 12:03   View User's Profile U2U Member Reply With Quote
I'd have the cheaper one. Especially if its made exactly the same. Basically your paying for the name.
Vaux Lad
Member
Registered: 15th Dec 04
Location: Stoke-on-Trent
User status: Offline
11th Oct 07 at 12:06   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by Iain M
I'd have the cheaper one. Especially if its made exactly the same. Basically your paying for the name.

That was just an example i made up,lol.

SBD manifolds are indeed top quality/well designed.
ed
Member
Registered: 10th Sep 03
User status: Offline
11th Oct 07 at 12:08   View User's Profile U2U Member Reply With Quote
Hardly. You couldn't justify that much extra if they are 'made the same'.

Did you measure torque too? That's where the differences lie between the two options.
Rhino
Member
Registered: 18th Oct 03
Location: Falkirk
User status: Offline
11th Oct 07 at 12:09   View User's Profile U2U Member Reply With Quote
Good test, not as big a differance as a thought there would be.
Jenko_Sport
Member
Registered: 25th May 06
Location: Stoke-on-Trent
User status: Offline
11th Oct 07 at 12:10   View User's Profile U2U Member Reply With Quote
Well looking at that graph theres about 5bhp difference.

Wouldnt mind seeing the torque fingures aswell and see the curve.
gavin18787
Premium Member

Avatar

Registered: 22nd Feb 05
Location: Basildon, Essex
User status: Offline
11th Oct 07 at 12:24   View Garage View User's Profile U2U Member Reply With Quote
Which price relates to which?

Would be nice to see the torque and a comparison to a standard item too

Drives supercharged Tec with torque
Dave A
USER UNDER INVESTIGATION - DO NOT TRADE

Registered: 10th Dec 03
Location: County Durham
User status: Offline
11th Oct 07 at 12:47   View User's Profile U2U Member Reply With Quote
wasnt enough difference in the torque graph to see, wasnt worth printing it out.

The map was adjusted for both manifolds accordingly but the only difference was the rev limit really. once the cylinder has ignited theres not much you can adjust on a map to make a big difference in the map exhaust wise.


Paul_J : we have found on many occasions that your engine works far better with a 4-1 anyway, raceland ones seem to work well
Paul_J
Member
Registered: 6th Jun 02
Location: London
User status: Offline
11th Oct 07 at 12:50   View User's Profile U2U Member Reply With Quote
raceland manifolds for gti's are 4-2-1 I know as I've got one.
Vaux Lad
Member
Registered: 15th Dec 04
Location: Stoke-on-Trent
User status: Offline
11th Oct 07 at 12:55   View User's Profile U2U Member Reply With Quote
Paul_J-
Out of interest, whats the engine spec on your GTi?
Paul_J
Member
Registered: 6th Jun 02
Location: London
User status: Offline
11th Oct 07 at 13:03   View User's Profile U2U Member Reply With Quote
106 gti
Kent Pt 51 cams
Chipwizards ECU remap
4-2-1 Mani
Pugsport Group N Decat Exhaust
Eccose enclosed with green filter
Dave A
USER UNDER INVESTIGATION - DO NOT TRADE

Registered: 10th Dec 03
Location: County Durham
User status: Offline
11th Oct 07 at 13:12   View User's Profile U2U Member Reply With Quote
sorry paul, typed that wrong. meant to say 4-2-1 see better gains and that Raceland ones are 4-2-1. which you already know
SwN
Member
Registered: 12th Mar 01
Location: Torbay
User status: Offline
11th Oct 07 at 13:31   View User's Profile U2U Member Reply With Quote
my old gti with pugsport and raceland enclosed filter and manifold pulled really well for a 1.6 engine , just once you got to 120(on private test track ) it ran out of steam , if i still had it i would have went the same route as you paul cams and remap
Robin
Premium Member

Avatar

Registered: 7th Jan 04
Location: Northants Drives: Clio 182 Cup
User status: Offline
11th Oct 07 at 14:49   View Garage View User's Profile U2U Member Reply With Quote
So, if the rev limiter hadn't been raised, there would be no difference in peak power at all, but the 4-2-1 is better low down, and presumably cheaper? (unless it was Protec vs SBD )
Dave A
USER UNDER INVESTIGATION - DO NOT TRADE

Registered: 10th Dec 03
Location: County Durham
User status: Offline
11th Oct 07 at 17:08   View User's Profile U2U Member Reply With Quote
a suprisingly precise guess there robin. everything you said was correct

 
New Topic
New Poll

Corsa Sport » Message Board » General Chat » manifold test results 24 database queries in 0.0153170 seconds