Friday 23 May 2014

Silverstone May 2014

For our first race of the season we raced at Silverstone with the 750MC in the Cartek Roadsports series.

We still hadn't had chance to see if the new fuel pump had cured the fuel delivery issues so it was straight into the deep end.

For qualifying we had an intermittent issue with the turbo pressure and ultimately the turbo control valve feed pipe split, but not before we had managed to put in a respectable quali time.
Assuming that this was the issue we temporally fixed the pipe that had split at one end  (buy cutting off the end) and it was race time.

Unfortunately the split pipe was masking another fault that was a dodgy N75 turbo control valve. So for the first half of the race we had intermittent turbo power. Then half way through it suddenly started working properly and we were 4s per lap faster. Unfortunately this was to little to late but at least we finished the race and enjoyed driving TTRS flat out around Silverstone.

We have since replaced the N75 Valve (to the brown one mounted upside down )and also uprated the feed pipes to the diverter valve and the with silicone ones from Forge.

Read the full report in TrackDriver Magazine

Bosch 044 Secondary Fuel Pump

Highlighted at our recent dyno testing at Shark Performance it appears that the injectors were wide open at 5000 rpm. This was causing the engine to run lean (not good) and ultimately shut down and loose power, we were using 550cc Bosch uprated injectors so this should happen. Time for a secondary race fuel pump!

It's a bit of an overkill but we went for the industry standard Bosch 044 as used in BTCC race cars etc. on the TT in fits neatly where the fuel filter sits and you can relocate the fuel filter in-line just before the fuel rail.

The secret here is to get a set of adapters from Badger 5 that fit the standard TT fuel connectors!

We also fitted a race fuel filter while we were at it:

 We used a 100A slave relay off the ignition wiring to supply the high current to the pump and heavy duty wiring.

Fuel pump in it's new home. It is quite noisy and would be too loud for a road car but in the tract you can't hear it what with your helmet and all of the other noise!

In our next race @ Silverstone it worked perfectly and had cured the problem!

Forge MAP Pipe

At a recent race at Donington the MAP sensor (Manifold Absolute Pressure) went down. Usually it's a five minute job to change, however the plastic pipe it goes into has captive nuts and they were just spinning so we couldn't get the old one off! Frustrating since we had a spare.

So we decided to fit a metal MAP pipe from Forge and while we were at it re-route the intercooler pipes a bit to make it even more accessible (made possible because we have a smaller race battery):

You can get these from: