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marcosv8

Welcome to the pleasurdome!!!

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Posts: 159

Fri, 12-Dec-2008 16:16

Apprentice mechanic

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Thought I would do an update on the Mantis for those that may be interested in these quiet months!

Following Dave's lead I took the car to a certain establishment south of London to fit new ECU, bigger injectors, fuel pumps etc. I won't bore you with the details on why - but the car (and I) were very unhappy bunnies when it left due to their lack of understanding on these engines - they can talk-the-talk, but!!!! ETC ETC!!!

A call to Topcats Racing and Omex the ECU makers revealed that Torque of the Devil tuners -http://www.torqueofthedevil.com/default.asp - were the guys to go see - so off she went to get the mess sorted. At last, someone who understood how to fit and wire-in the ECU and map it correctly. These guys really are excellent - they do development work with Maclaren, map the Topcat Racings cars and also work with the Top Gear crowd - I recommend them to everyone.

We decided that a change of charge-cooler would be of benefit to help air-flow and temp reductions to suit the smaller charger pulley - so on went a new PWR air-to-water unit and larger Bosch pump. This fits in the position of the old Pace unit a treat and is rated to lose less than 1PSI up to 600 BHP and 20 pounds of boost. I can confirm this is a worthy upgrade - engine now runs much cooler at 15 PSI boost, although a new 2000 CFM rad fan may be helping here.

Having fixed all the mistakes made at '********' the car was re-mapped to the new upgrades and is now running like a dream - at last!!!

Engine is now running at just over 550 BHP and more importantly, 500+ lbs/ft of torque - on what T.O.T.Devil say is a very conservative rolling road!!! - so money (DON'T ASK)!!! - well spent?? LOL.

Next project is a 6 speed box - T56 Tremec unit. I have sourced these for about one third of 'normal' money in the UK -so if anyone wants one - let me know. I will report back when it is fitted as to how it all went.

P.S. - A word to the wise - if anyone else fits a new ECU to a Mantis, make sure the guys fitting it realise that they need to open the secondary butterflies in the inlet tract at 3200rpm with the new ECU, or - better still on a S/C setup - take them out as I did.

RR

Last Edited By: marcosv8 Thu, 18-Dec-2008 00:46. Edited 1 time.

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Gary Harman

#1

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Posts: 1718

Fri, 12-Dec-2008 16:29

Guru mechanic

Thanks for those comments, it is appreciated. Lots of companies seem to be able to talk the talk but when it comes to the actual work there are very few I would trust, and I hate going to a unknown company.

Glad it is all better now though.

Gary

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anon

#2

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Posts: 711

Thu, 18-Dec-2008 18:29

Any news on why Daves head gasket went ? was this related to the upgrade, I do wonder whether the std head gaskets can take the super charging beyond a point or whether they should be changed and the CR lowered a little.

Bit surprised about the secondary butterflies, Phil said the same as you whereas my car has already had them removed.

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marcosv8

#3

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Posts: 160

Thu, 18-Dec-2008 19:21

Apprentice mechanic

No - no news on Dave's engine this end of the country - that's for him to comment on I recon anyway. Come on Dave - what's the news????

It would appear that both yours and Dave's had the IMRC plates removed then - whereas mine and Phils were not - well - not from the factory anyway!! Mine now modified to open runners at all times.

Lowering compression ratio with a centrifugal charger is not recommended it would appear - but you do need to fit ARP studs when fitting the heads to hold them down I am informed. Sean Hyland uses standard head gaskets on high HP engines with no worries he tells me. Roots type blowers are a different story and need a lower C/R.

So come on Dave - let's have an update?????

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The Quiffster

#4

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Posts: 3316

Sun, 11-Jan-2009 22:49

Administrator

marcosv8 wrote:

So come on Dave - let's have an update?????

... I second that. Come on, you posted this last year! (If you see what I mean...

)

The Quiffster

Unregistered user?, Why not come in out of the cold? It's painless, free and opens other options up to you. Spare less than a minute of your time and register here, go on, you know it makes sense!

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marcosv8

#5

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Posts: 163

Fri, 20-Feb-2009 14:06

Apprentice mechanic

Next project is a 6 speed box - T56 Tremec unit. I have sourced these for about one third of 'normal' money in the UK -so if anyone wants one - let me know. I will report back when it is fitted as to how it all went.

Now fitted and sweet-as. Worthy, inexpensive upgrade IMHO. Plus - 75 @ 2000 RPM in 6th gear - should save a fortune in gas -

. Very easy to fit as well - just had to move the crossmember 1" forward - gear lever position unchanged so no need to change car interior in any way!!

Anyone need a T45??? PM to make me an offer.

RR

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mendamantis

#6

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Posts: 242

Fri, 20-Feb-2009 23:03

So 6th brings the cruising RPM down even further but does the gap between 4th and 5th reduce much.

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marcosv8

#7

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Posts: 164

Mon, 23-Feb-2009 12:01

Apprentice mechanic

mendamantis wrote:
So 6th brings the cruising RPM down even further but does the gap between 4th and 5th reduce much.

Ratios as follows

T45 T56

First 3.37 2.97
Second 1.99 2.07
Third 1.33 1.43
Fourth 1.00 1.00
Fifth .67 .8
Sixth - .62
Reverse 3.22 3.28

This is a bit of fun >>>>>>

Table at end has been calculated using correct ratios etc for my car:

This calculator will give you a table of your speed in mph per rpm in each gear. The default is for the Impreza 2.5 RS. Fill in your specs to get a custom table. A factor of 0.965 was used to account for the reduced tire diameter caused by numerous factors (see below). Every tire will be slightly different, so these numbers are purely estimates. It's impossible to calculate a precise value.

Select a car from this list: Select 2001 Audi TT Quattro Roadster 2001 BMW M Roadster 2001 Chevrolet Corvette Z06 2001 Dodge Neon R/T 2000 Ford SVT Mustang Cobra R 2001 Ford ZX2 5-speed 2001 Ford ZX2 Automatic 1994 McLaren F1 2000 Mercedes-Benz C320 2001 Mercedes-Benz SLK320 2001 Nissan Sentra SE 1999 Porsche 911 Carrera 2001 Porsche Boxster 2000 Rolls-Royce Corniche 2000 Subaru Impreza 2.5 RS 2000 Subaru Impreza P1 (U.K.) 2000 Subaru Impreza Turbo (U.K.) or fill out the form below.

Tire Size:
//

Final Drive Ratio (Axle Ratio of driven wheels):

Gear Ratios
1:
2:
3:
4:
5:
6:
7:

RPM Redline:

RPM Increment:

	1	2	3	4	5	6
0	0.0	0.0	0.0	0.0	0.0	0.0
500	3.9	5.6	8.0	11.5	14.4	18.5
1000	7.7	11.1	16.1	23.0	28.7	37.1
1500	11.6	16.7	24.1	34.5	43.1	55.6
2000	15.5	22.2	32.1	46.0	57.4	74.1
2500	19.3	27.8	40.2	57.4	71.8	92.7
3000	23.2	33.3	48.2	68.9	86.2	111.2
3500	27.1	38.9	56.2	80.4	100.5	129.7
4000	30.9	44.4	64.3	91.9	114.9	148.3
4500	34.8	50.0	72.3	103.4	129.3	166.8
5000	38.7	55.5	80.3	114.9	143.6	185.3
5500	42.6	61.1	88.4	126.4	158.0	203.9
6000	46.4	66.6	96.4	137.9	172.3	222.4
6500	50.3	72.2	104.5	149.4	186.7	240.9
7000	54.2	77.7	112.5	160.9	201.1	259.4
7100 redline	54.9	78.8	114.1	163.2	203.9	263.2

Honest Officer?? - HOW FAST????

LOL

RR

Last Edited By: marcosv8 Mon, 23-Feb-2009 12:06. Edited 2 times.

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