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Old 5th February 2011, 15:47   #1 (permalink)
 
 
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TDi North Mugen FN2. Graphs on p1

Bit of an update for everyone on our Mugen FN2

The cars been used for testing a lot of new parts and done a lot of miles including several track days so we decided to drop the motor, carry out an inspection and give it a bit of a refresh with a few uprated parts and prepare for some other developments later.

On inspection, the engine even after 60,000 miles was in very good condition with no signs of wear and all bearings and surfaces within tolerance and no signs of any piston/head wear.

We set about stripping the motor down to a bare block and fully reconditioned the head including new stem seals, re-lapping the valves back in, fitting uprated Toda springs in while the engine was out for any future cam changes and port matching the head to the intake and exhaust manifolds.


Neil lapping in the valves. We are still using the original ones.



Port-matched intake manifold



Assembled head port matched to the manifolds with new springs fitted.



Cleaned block with new FD2 coated pistons and Toda 0.6mm Head gasket



Toda tensioner



Toda timing chain



Toda oil pump fitted.



Assembled engine ready for going back in










I the meantime I thought I would try running the stock manifold and cat and seeing how that drove and what power I could make with interesting results making 245bhp/170ft.lb

I then re-fitted the Toda manifold and re-tuned to that to where we currently are now at 252bhp/179ft.lb

TDi North FN2.pdf

For more information give us a call or email at [email protected] and see what we can do for you.

UPDATE:

We have just installed the Toda A3 camshafts and just done a rough MAF base tune as we havenít had time to do a full tune yet but results are looking good.

Attached are a couple of dyno sheets so you can compare:

This is how the car stands now. Slight fluctuation in plot is due to a lost balance weight. Will sort this next week



This plot is the car how it is now compared to one pretty well modified with an intake, RRC, Manifold and exhaust dyno tuned just so you can get an idea of the gains achievable from what will feel like a "fast" car.



And this plot is the car as it is today and also same mods but with the JDM cams.
£ 4 £ the JDM cams are still a really good option.



Update:

Quick update as to where we are currently with the car.
Chassis wise we are trialling a new Polybush Masterbush set on the car and its looking really good. Stiffened it up quite nicely and steering feels a lot more precise.

Power/performance wise we have been testing the new Skunk2 72mm throttle body with our setup for a while and I wanted to make 100% sure that it would work well with no issues since the manifold is custom ported to the head and this week we finally got round to port matching it to suit the throttle body.
We have matched it up with a true 70mm ID Aluminium intake pipe so its pretty much as smooth straight flow as we can get.

Pretty pleased with it and it showed good gains over the previous setup proving that the intake pipe/throttle body is causing a bottle-neck in the system.






Last edited by tdi-north; 28th October 2011 at 15:35.
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Old 5th February 2011, 15:58   #2 (permalink)
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whats the difference with the FD2 pistons, Higher CR ? and is the Toda gasket thinner to?

Good work guys, keep it up
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Old 5th February 2011, 16:06   #3 (permalink)
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Its making the engine slightly higher compression so its now pretty much the same spec as the FD2 engines and its making the same sort of numbers we get out of them with good I/H/E mods and a re-tune.

In reality its sometimes not a good thing going high compression unless you are running better fuels and can take advantage by increasing the ignition values. ther side of the coin is by increasing the compression, you are actually reducing the combustion chamber volume and on normal pump gas loosing some power compared to if you had kept it standard.

Point of the exercise was to evaluate for wear after a lot of hard use and to refresh to see what we could acheive with pretty much all OEM available parts. The only non OEM and ones which really make no difference other than they offer more durability you could say are the oil pump kit, timing chain, tensioner and valve springs. All which then come into play when I install some more lively camshafts.
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Old 5th February 2011, 16:10   #4 (permalink)
 
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I drove this last week and got to say it is unbelivable the power delivery is amazing and pulls right threw the rev range...I want I want I want!!!
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Old 5th February 2011, 16:36   #5 (permalink)
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Daz you can't have one!!! So there
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Old 5th February 2011, 16:38   #6 (permalink)
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To be honest it's looking really good and shows what options are out there from the mild to the INSANE. Perfect advertising tool!!! "THE CAR!
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Old 5th February 2011, 17:07   #7 (permalink)
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thats a great result bhp wise, 250+ is fantastic. nice one guys.
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Old 5th February 2011, 17:13   #8 (permalink)
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Excellent work guys i'm looking forward to seeing the car again next week.
Top job.
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Old 5th February 2011, 17:42   #9 (permalink)
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Look forward to more
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Old 5th February 2011, 17:59   #10 (permalink)
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Looks great, good result too!
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Old 5th February 2011, 20:06   #11 (permalink)
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Looks great Paul! Was wondering about the sudden flattening of the power curve though from 8K upwards. Do you think it could be because of the slightly restrictive exhaust? Looks like you could make nearer 260bhp with a 'freer' top end
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Old 5th February 2011, 20:34   #12 (permalink)
 
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nice work! hopefully get taken out in this on the 16th?? haha
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Old 5th February 2011, 20:44   #13 (permalink)
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Quote:
Originally Posted by Lunar Tick View Post
Looks great Paul! Was wondering about the sudden flattening of the power curve though from 8K upwards. Do you think it could be because of the slightly restrictive exhaust? Looks like you could make nearer 260bhp with a 'freer' top end
That's exactly it
Been there done that haven't we!
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Old 5th February 2011, 20:51   #14 (permalink)
 
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we saying the toda is a restrictive exhaust?

and what does port matched mean??

Last edited by higham; 5th February 2011 at 20:54.
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Old 5th February 2011, 20:58   #15 (permalink)
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Not necessarily. It flattens out as I allowed the engine to rev higher as power wasn't dropping off. With the stock manifold it was so there was no point revving higher.
It's basically a limitation of the camshafts with this setup. we already know the exhaust manifold and exhaust isn't ideal but we can't do anything about that due to design constraints. When it comes to exhausts straight is best. Not loads of 90' bends and splits!
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Old 5th February 2011, 21:02   #16 (permalink)
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My car on the ramp in the last photo

I was lucky to have a ride in paul's car the other day great experience! Once again, thanks TDi north for the service and the tour around the garage Hopefully be visiting you guys again soon!
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Old 6th February 2011, 00:32   #17 (permalink)
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Bigger tb, match bored RRC , bigger intake and bigger exhaust and 265/270 bhp are a reality...
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Old 6th February 2011, 03:16   #18 (permalink)
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Eco display
Very nice indeed.
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Old 6th February 2011, 03:25   #19 (permalink)
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Oooo I can't wait for a spin. COME HERE!!!!!!!!!
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Old 6th February 2011, 04:10   #20 (permalink)
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very nice mate, i need to get my car booked in
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